JP2004154599A - Improved sleeping mat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sleeping mat which dissolves discomfort during sleeping caused by a difference between pillow height (Hp) suitable for a side lying attitude and pillow height (hp) suitable for a face-up attitude. <P>SOLUTION: A pocket which can house a shoulder part and an upper arm part positioned lower in a side-lying attitude in a sufficiently fallen-in condition is provided in both arm pit corresponding parts of a sleeping mat used adjacent to a pillow, and a rear neck support part in a face-up position is provided between the pillow and the sleeping mat. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a bedding, and more particularly, to a novel shape structure for reducing physical stress at bedtime of a type used on an underlay mat or a bedding or directly on a floor surface and adjacent to a pillow. The present invention relates to an improved bedding and an auxiliary bedding based on the improved bedding for a person having a bent back.

  It is clear that bedding is an important physical requirement affecting bedtime rest and sleep. According to one theory, the use of modern futons in Japan began in the Edo period, and cotton was the main material (heart material). This traditional futon was only gradually improved and improved, but in recent years, with the advancement of science, various and various materials have been provided, processing technology has advanced, and bedding has been dramatically improved. It is getting.

  As the material of the bedding, there are cotton, feather, wool, pure cotton (silk), synthetic fiber (example: polyester) cotton, etc., which are elastic, heat-retaining, moisture-absorbing, (absorbed moisture), It has been used for the purpose of obtaining comfortable sleep based on various required characteristics such as moisture permeability. In addition, with the expectation of health promotion or certain medical effects and other effects, there are also those in which magnets are buried and arranged, those that are filled with charcoal, and those that use far-infrared radiation materials.

  Beds have come to be used considerably with changes in Japanese lifestyle, and various spring arrangements have been devised. Further, air beds, water beds, etc., which are filled with fluid and sealed, have also been proposed. Regarding their internal structures, not only one-pack type but also pipe type, multi-chamber type, etc. are seen.

  The bedding or bed has good feel and moderate elasticity in addition to satisfying temperature and humidity-related characteristic requirements such as heat retention, heat dissipation, moisture absorption, (absorbed moisture) diffusion, and moisture permeability as described above. And hardness and the like. These latter physical properties are thought to be important for the posture of the body during sleep, especially for straightening the spine (as viewed from the front or back) so that it can be turned over without difficulty.

  Pillows can also be mentioned as one of the necessary beddings to get a good night's sleep. Pillows have also been made from various materials since ancient times, and various requirements such as breathability, heat dissipation, moisture absorption, moisture release, heat conductivity, elasticity, hardness, and feel are taken into consideration.

  An important factor in the choice of pillow is its "height", which generally fits comfortably between the occipital height (hp) and the cervical vertebrae height (hc) when lying in a supine position. It is often determined whether or not to do so (see FIG. 1). However, it is rare that the supine position is maintained during bedtime, and the patient turns several times to several tens of times during the night, for example, turns around from about 20 times to roll from the supine position to the recumbent position, and is in the recumbent position. The time is considerably longer. In order to keep the cervical vertebrae and the spine almost straight without stress in the recumbent position, the occipital height (hp) or the cervical vertebrae height (hp) in the supine position described above due to the presence of the shoulder of the human body. The height of the comfortable pillow selected according to hc) is generally too small. Therefore, in order to keep the cervical vertebrae and the spine almost straight in the recumbent position without stress, a pillow having a higher temporal height (Hp) as shown in FIG. 2 is preferable. Therefore, the pillow height (hp) selected as optimal for the supine position is too small for the optimal pillow height (Hp) for the recumbent position, and conversely, the optimal pillow height (Hp) for the recumbent position. ) Creates a dilemma that is too large for the optimal pillow height (hp) for the supine position. If the pillow is too low when lying down, the pressure on the shoulders will be large and the head will bend down, the neck will bend and the neck and the muscles around it will be stressed. If the pillow is too low, the (rolling) angle of the turning becomes small (not reaching 90 °), and a sufficient posture change cannot be obtained, or the (rolling) angle of the turning becomes large. (More than 90 °), which may lead to an excessively lowered posture, which may cause fatigue during sleep, sprains of the neck, stiff shoulders, and the like. Many commercially available pillows have an intermediate height between the above-mentioned hp and Hp. Therefore, even if the subject sleeps in a supine or recumbent position for a long time, fatigue may even occur.

  Some recent commercially available pillows have a low (concave) contact with the occiput and a relatively high end at both ends in order to keep the spine straight and natural even in a recumbent position. However, it may not be smooth to roll up the head that was in the recess when lying in the unconscious or semi-conscious state while lying in a supine position and turn to relatively high ends when turning over. In many cases, the head is not completely turned sideways on both ends (rolling almost at a right angle), but in a halfway state at the middle slope (the neck is twisted by rolling at about a half right angle) It may stay. Conversely, when lying down in the unconscious or semi-conscious state while sleeping, the head lying sideways on the relatively high ends of such a pillow rolls into the lower recess when turning over, the head is in the middle You may feel anxious about falling suddenly on the slope. Therefore, even if the above-mentioned commercially available pillows can be used with good usability when awake, they cannot always be said to be comfortable when turning over while sleeping unconsciously or semi-consciously.

  An object of the present invention is to provide a comfortable sleep by substantially reducing or eliminating the various problems related to the pillow as described above by devising a shape of a bedding used together with the pillow. An object of the present invention is to provide the above-mentioned futon, which acts to relieve and eliminate stress generated in muscles of various parts of the body during activity while sleeping.

  Many people complain that shoulder stiffness, neck pain, headache, feeling of fatigue remain after waking up, but the main cause is that stress on the muscles around the cervical vertebra, thoracic spine and lumbar vertebra etc. remains without being released during bedtime, It is believed to accumulate. Stress on the muscles of the back is related to the shape of the person when standing (see FIG. 3), and the heavy head is supported by the spine and various muscle groups, ligaments, and tendons around it. In the vertebral column, a large number of vertebrae such as cervical vertebra, thoracic vertebra, and lumbar vertebra are connected like a building block to form a loose S-shaped curve, thereby forming an important structure that functions as a cushion. The head tilts forward most of the time, except when the person is asleep, at which time the force on the spine is similar to a bowed string, causing stress on the outside of the back . Such time usually lasts 16 hours or more per day, and it can be said that most of them are in a stress state even if they stretch or turn their neck in the middle. The present invention provides an improved bedding that releases, reduces, and eliminates the physical stress generated during human activities including the above-mentioned stress at bedtime. The present invention further provides an improved mattress, which is further modified to provide an auxiliary mattress for a person whose back is bent.

Thus, the present invention provides an improved bed for reducing physical stress at bedtime which has a generally elongated rectangular planar shape of a type used adjacent to a pillow on an underlay mat or a bed or a floor surface and has a certain thickness. Futon and:
(I) from the lying-up supine position on the longitudinal center line (X) of the longitudinal rectangular body to the left or right, the body is rolled by almost one right angle and turned over to the recumbent position, from the shoulder to the upper arm of the lower body; Having symmetrical pockets (A, A) that can be accommodated in a substantially depressed state over
(Ii) A state in which both upper edge corners are symmetrically cut off such that the pockets (A, A) leave a back support portion (B) in the shape of a mountain-like plane near the center of the upper edge of the vertically elongated rectangular body. Being formed of
(Iii) A part (D) for supporting the body part from the upper back to the back neck from below by almost making up for the gap (C) that usually occurs at the step from the mattress to the pillow in the supine position. The pillow is provided so as to extend further along the center line (X) from the back support portion (B), and the pillow is used adjacent to the extension portion (D);
The above-mentioned improved mattress is provided.

  When sleeping in a supine position, it is ideal to use bedding that supports the head with uniform pressure from the back of the head to the cervical spine. Considering the pillows in particular, the height of the cervical vertebra (hc in FIG. 1) is an important factor in removing the stress that occurs in the levator scapula from the neck to the shoulder and the muscles around it during waking up and activity. is there. In addition, in order to remove the stress generated during the activity from the back (corresponding to the thoracic vertebra) to the waist (corresponding to the lumbar vertebra), the force from the direction of the arrow (two places) in FIG. When using a bed with an appropriate hardness (for example, about 20 kg measured by a JIS test method in the case of polyurethane), an appropriate repulsive force is generated at the above-mentioned arrow depending on the weight and the above-mentioned stress is applied. It is effective to exclude. Thus, even when sleeping in the supine position using the ideal combination of the pillow and the bedding, there is a space C shown by hatching in FIG. 1 due to the step between the pillow and the bedding. . At this space C, a force is applied from the chest to the back, and this force is in the same direction as the stress that occurs when a person is awake and active. The erector spinae and other muscles are in tension, which can cause stiffness of the muscles from the back to the shoulder and does not provide a clean awakening. Therefore, in the present invention, in order to solve this problem, a portion (D) for supporting the body portion from the upper back to the back neck from below is provided by substantially compensating for such a gap (C), and a pillow is provided on the portion. Are used adjacent to each other.

Next, the condition of the bedding in the recumbent posture will be considered. The biggest problem when sleeping in a lying position is to minimize the pressure on the shoulders. As for the pillow, in order to solve the problem, the optimal height (Hp) of the pillow in the recumbent posture is considerably higher than the optimal height (hp) of the pillow in the supine posture. When the optimal height (Hp) of the pillow in such a recumbent position is calculated by ignoring the sinking of the futon (see FIG. 4):
Hp = (p−q) / 2−α
It becomes. p is the width of the shoulder when the shoulder is shrunk, q is the width of the head, and α is a value that allows the head to lean naturally within a stress-free range when lying down. It will be around 3cm. The difference between Hp and hp to eliminate pressure on the shoulder during recumbency:
H = Hp-hp
Must be considered. This difference H can be seen with reference to FIG.
H = (pr) / 2
(P is shoulder width when pursed shoulder; r is chest width)
, And corresponds to the width of the hatched portion from the side to the bottom in FIG.

  In view of the fact that the upper arm comes from the shoulder to the lower side of the torso and presses on the chest when in the recumbent position, and these portions themselves are pressed by the weight, the present inventor considers that these body parts are substantially It was conceived to provide pockets that could be depressed (or sunk) and placed symmetrically on the bed, and that the part supporting the back when supine be left in the center of the bed. In this case, the thickness of the bedding (or the depth of the pocket) theoretically takes the value of H, but the actual value varies depending on the elastic modulus of the material. Therefore, as shown in FIG. 7, the bedding of the present invention is symmetrical with respect to the longitudinal center axis (XX) at both corners of the upper edge, and extends from the shoulder to the lower arm in the reclining position from the shoulder to the upper arm. It has pockets (A, A) which can be accommodated in a substantially depressed state and has a notched state, and has a back support portion (B) having a mountain-shaped flat shape near the center of the upper edge. A portion (D) for supporting a portion from the upper back to the back neck from below is extended from the upper edge of the back carrying portion. A pillow (height = Hp) is used adjacent to the extending portion (D). FIG. 5 shows an example of the mode of use. In this example, the bedding (b) of the present invention is laid together with a pillow (height = Hp) on a usual bedding or an underlay mat (a). (Hp is as defined above). The bedding of the present invention can be used without a usual bedding or an underlay mat (a). In this case, the thickness (H ′) of the main body is made larger than the theoretical value (H) (see FIG. 6). Although the improved futon of the present invention, especially the portion (B), has a thickness theoretically equivalent to H as described above, the material of the futon itself may be submerged (compressed). May actually have to be thicker than H due to factors such as the modulus of elasticity. In short, the thickness of the bedding of the present invention, that is, the depth of the pockets (A, A) theoretically depends on the physique (shoulder width, chest width, etc.) of each user, but in practice The upper part only needs to be large enough to substantially drop the part from the shoulder to the upper arm, so that the chest compression from the shoulder to the upper arm and the pressure on the shoulder itself can be effectively performed in the recumbent position. Is reduced.

Width W ₁ is the width r ± 2 cm about the chest of the back carrying portions of the chevron shape in plan view (B), and the length L ₃ is the distance between the points K ₂ ~ point K _3, point K ₂ are thoracic 4 corresponds to the vicinity of Ban (T4), the point K ₃ is in the vicinity of the solar plexus. A suitable length L ₂ + L ₃ for an adult is around 20 cm.

Extension for supporting a portion of the over the rear neck from below further to the upper back extending from the back carrying portions (B) (D) of the length L ₁ + L ₂ is between points K _o ~ point K ₁ ~ point K ₂ Is the distance. Point K _o is a position in contact with the pillow, (to C6 without C7) 6 to seventh cervical vertebrae corresponds to the vicinity of the point K ₁ corresponds to the vicinity of thoracic No. 2 (T2), the point K ₂ is as defined above is there. The approximate value of L ₁ is about 5 cm and L ₂ is also about 5 cm, and the total of both (L ₁ + L ₂ ) is about 10 cm (normal adult physique). While the width W ₂ of the extension (D) in the specific example shown in FIG. 7 is smaller than the width W ₁ of the back bearing portion (B), the value of the neck is stable when the supine posture, for example, if about 18cm longitudinal Well, W ₂ = W ₁ may be satisfied. The cross-sectional shape of the extension portion (D) in the vertical direction (XX axis direction) roughly corresponds to the gap (C) in FIG. 1, and its function is to support the upper back to the back neck in the supine position from below. It is in.

Specific example shown in FIG. 7, extension (D) is a preferable example which is composed of two blocks D ₁ and D _2, no problem be constructed from a single block. In the illustrated example, D ₁ is via the thoracic No. 2 a (T2) thoracic 4-5 No. (T4 to T5) act to relieve stress in the vicinity of, its length L ₂ is approximately about 5cm as described above (Adult). The material of D ₁ is thoracic 1-5 No. (T1T5) rebound and hardness for supporting the vicinity of the or slow from below is determined with the body B. In the case of foamed polyurethane, it is preferable that its hardness is around 20 kg (measured by JIS test method). D _2, the contact point between the pillow from thoracic No. 2 (T2), that is, located at 6-7 No. cervical (C6~C7), when the supine posture, head and cervical arc mainly pillow because and chest supported on is mainly supported by B and D _1, mechanical or mechanical function to support the D ₂ is not required much. However, D ₂ has an important meaning when the body shifts and the lower shoulder comes within the range of the width W ₂ of D (D ₁ + D ₂ ) when turning over to the recumbent posture. There is a possibility that the necessary sinking may not be sufficiently performed. Even in such a case, if a very soft material is used as D ₂ , the acromion (bone of the shoulder) located there can easily sink into D ₂ . The hardness of the D _2, for example, in the case made of foamed polyurethane, are preferred the following hardness of about 5 kg (measured by JIS test method).

  The length (Lx) of the hatched portion (C) in FIG. 1 in the vertical center axis direction (XX) is represented by the following equation: Lx = L1 + L2 + α, where L1 and L2 correspond to D2 and D1, respectively. , Α extend to the body (B). The appropriate value of α varies depending on the body type. In the case of a standard person who is bent near the thoracic vertebra 5 (T5), α is about 0 to 5 cm, while it is bent near the thoracic vertebra 8 (T8). In the case of a so-called stoop-shaped person, α is about 10 to 15 cm.

  Regarding the height, the height of the Ko point in FIG. 8 does not have much problem for the above-mentioned reason (D2 does not require mechanical and mechanical functions). However, the height at the position K1 of (D1) is very important for relieving and eliminating stress. If the height is too large, stress may be generated. Factors such as the hardness of the main body, the degree of sinking of the body, the height of the pillow used together, the body type, and the like are affected, but as an example, the hardness of the main body is less than 20 kg, the standard body shape, the height of the pillow ( When (hp) = 3 cm and (hc) = 6 cm (adult), the height above the point (K1) in FIG. 1C is about 1 cm. The body shape when the human body is viewed from the side can be roughly classified into an S shape and a flat shape (close to a straight shape). In the case of the S-shape, it is said that the hardness of the mattress is almost entirely uniform, but in the case of the flat type, it is better to be harder than the other part in the buttocks-equivalent part and its vicinity. It is said that. Looking at the data of the posture during sleep, it is common that the lower part of the buttocks is larger than the lower part of the back. In other words, it may be better to make the entire body (B) supporting the back harder or slightly thicker than the others.

As is clear from the above, the improved bedding of the present invention preferably has an appropriate hardness for each part. For example, when each part is made of foamed polyurethane, the hardness of the main body including the back support part (B) is about 20 kg as measured by the JIS standard test method, and about 20 kg and 5 kg for the extended parts D ₁ and D ₂ , respectively. I think the degree is preferable. Such a hardness distribution can be achieved by laminating block materials having respective hardnesses (post-adhesion), but for foamed polyurethane, different mixed stock solutions having a predetermined target hardness are continuously arranged in one mold. A method of making a molded product having partially different hardness in one step (that is, a foaming method of different hardness) has been put to practical use, and the bedding of the present invention can also be manufactured by this method.

  FIG. 9 is a plan view showing a futon according to a modified embodiment of the present invention. This plan view is the same as that of FIG. 7, except that a low-hardness, flexible material (E) is replenished and arranged at a part or almost the entire area of the pocket (A, A) in FIG. The difference is that a hardness transition zone (E ') made of a material having a hardness between the two is provided between the shoulder portion of the main body and the material. If the auxiliary bed material, the low-hardness and flexible replenishing arrangement material (E) and the hardness transition zone (E ') material are made of foamed polyurethane having different hardness, their suitable hardness range is about 15%. ２５25 kg, preferably about 20 kg (body), about 4-7 kg, preferably about 5 kg (E) and intermediate values thereof of about 10-18 kg, preferably about 15 kg (E ′) (all measured by JIS test method) ). However, even though the hardness of polyurethane is the same, the way of feeling differs depending on the thickness of the thickness. Therefore, the above hardness is not an absolute value but changes depending on the thickness. The effects of the replenishment arrangement material (E) and the hardness transition zone (E ') in this modified embodiment are as follows.

If E and E 'as described above are not present:
(1) The human body in contact with the boundary between the bed (A, A) of the bed and the shoulder, particularly the shoulder of the bed, when the bed is turned over and the bed is lying down and the bed is relatively hard. The flank may be squeezed and feel uncomfortable.

  (2) In the supine position, the upper arm (upper arm) is located along the vertical edge of the back carrying portion (B) in one pocket (A), and especially when the pocket (A) is deeper, it is hollow. Therefore, it may be in a state of being suspended in the air to some extent, causing an unstable feeling.

(3) When the woman is in the horizontal position, the breast is located at the pocket (A), which may cause a lack of stability and security as in (2) above.
These problems (1) to (3) are substantially alleviated by providing the replenished flexible material (E) and the hardness transition zone (E ') as described above. In the case of the above (2), the part beyond the elbow is supported on the bedding main body, and the upper arm is almost suspended in the pocket. Because it may be supported (for example, touching lightly), a sense of stability and a sense of security are provided. The same applies to the case of the above (3). Therefore, in this modified embodiment of the present invention, the low-hardness, flexible material (E) is replenished and arranged at an appropriate place in the pockets (A, A) (a part or almost the entire area of the pockets). In the case of the above (1), the hardness transition zone (E) made of a material having an intermediate hardness between the hardness (very low) of the replenishment-placeable flexible material (E) and the hardness of the bedding (very high). By providing '), pressure on the flank when lying down can be significantly reduced. That is, by softening the hardness difference in the hardness transition zone (E '), it is possible to soften the contact with the flank. The width of the hardness transition zone (E ′) may be about 3 cm. The longitudinal length of the replenishment arrangement material (E) is equal to or less than the longitudinal length (L _{3 in} FIG. 1) of the back support portion (B), for example, about 18 cm, and the width thereof is equal to that of the pocket (A). The same as the width is convenient for handling. The thickness of the replenishing arrangement material (E) may be the same thickness as the thickness of the bedding main body or a suitable thickness more than that. The above is only the case where the thickness (H) of the main body and the height (Hp) of the pillow are the ideal theoretical values. Therefore, when the thickness (H) of the main body is larger (thicker) than the ideal theoretical value, the flexible material (E) is formed over the entire area up to the (K _o ) point of the pocket (A, A) or the point of contact with the pillow. Should be replenished. As the body becomes thicker, its hardness may be reduced, so that the hardness transition zone (E ') may be omitted in some cases.

  When the bedding of the above-mentioned modified embodiment is made of foamed polyurethane, a material of different hardness having an appropriate hardness for each portion, a material having an appropriate size for each portion, and post-adhesion. Can be manufactured. Alternatively, it can be efficiently manufactured by continuously injecting mixed stock solutions having different predetermined hardnesses into one mold (mold) to obtain molded products having partially different hardnesses in one step.

The present invention also provides an assistive bedding for a person with a bent back. (1) A person who has a lot of desk work, a person who has a lot of light work on a table, and a person who is tall tend to be permanently bent at the upper part of the back corresponding to the vicinity of the thoracic spine 1 to 5, and (2) bend deeply. For those who work in the thoracic spine, it is easy to bend permanently at the center of the back corresponding to the vicinity of the thoracic spine 5-10. It tends to be permanently bent at the lower part corresponding to the number 1 or the sacrum number 1. Humans exert stress on muscles, ligaments, tendons, etc. around the spine during work or activity, and if the stress is not released, they accumulate and lose the flexibility of muscles and ligaments, It is said to be "lumps" and gradually become ossified, which is the cause of the permanent bending as described above. In the above cases (2) and (3), the bend is generally large, and for such a person, the pillow height (hp) suitable for the supine posture is larger than the pillow height (Hp) suitable for the recumbent posture. Often higher. When a person in this condition takes a supine position, a space generated at a length (L _x ) from a point (K _o ) in contact with the pillow to a bent point (K _x ) on the back as shown in FIG. (Shaded area) becomes larger. Unless such a large space is filled, a good sleep cannot be obtained.

Accordingly, the present invention provides, as yet another aspect, an auxiliary bedding for a person whose back is still bent, wherein the thickness of the bedding is from the bending point (K _x ) of the back to the pillow. Is also provided in harmony with the degree of back bending. FIG. 11 is a plan view and FIG. 12 is a side view of an example of the auxiliary bed in this embodiment. The reference numerals in these drawings 11 and 12 are the same or equivalent to those shown in FIGS. 7 to 9, but in this example, the vertical dimension (K _{o to} K _x , that is, L _x ) may be shorter. It is preferable to provide a flexible material zone (F) near the _Kx point (that is, near the lower edge) to eliminate the feeling of a step so as to eliminate uncomfortable feeling during use.

  As described above, the improved bedding of the present invention has a bilaterally symmetrical cutout in consideration of the drop of the elbow from the shoulder and upper arm in the recumbent position, and further extends the neck support portion, It has a convex (double Mt. Fuji) or convex (Mt. Fuji) basic planar structure. Preferably, the notch is filled with a material having a very low rebound resilience. The mattress of the present invention can be made of any material by combining the materials of the conventional mattresses, as long as the material has a function suited to the purpose in terms of shape and elasticity and hardness of each part. However, foamed polyurethane materials are easily available in various hardnesses and resiliences, and processing techniques capable of manufacturing various molded products of different hardness have been established. Material.

  The dimensions of each part of the improved bedding of the present invention and, in some cases, hardness, elastic modulus, etc., are dependent on the physique and weight of the individual user, but by aligning several standard size types , Can sufficiently respond to demand.

  The bedding of the present invention is suitable not only for healthy persons but also for assisting the sick and elderly, and is particularly effective in preventing floor rubbing due to the ease of turning over. In general, misplacement (misalignment of the neck), which may occur suddenly when turning over, can be effectively prevented by using the improved bedding of the present invention.

A sleeping side view in a supine position using a pillow. The sleeping head sketch in the reclining position using a pillow. FIG. 3 is a human spine curve diagram in a standing posture. The human body front view. FIG. 4 is a side view of an example of using the improved mattress of the present invention. The use example side view without the underlay mat of the improved bedding of this invention. Basic floor plan of auxiliary mattress basics. The side view of FIG. FIG. 4 is a plan view of a modified example of a modified bedding. The supine posture bedside view of the person whose back was bent. The top view of the modification example of the auxiliary mattress. The side view of FIG.

Explanation of reference numerals

A Pocket B Back support C Step gap D Neck support extension E Flexible filler E 'Hardness transition zone

Claims (4)

An improved bedding for reducing physical stress at bedtime which has a generally vertical rectangular flat shape of a type to be used adjacent to a pillow on an underlay mat or bedding and a floor surface and has a certain thickness. :
A part (D) for supporting the body part from the upper back to the back neck from below,
The pillow is used adjacent to (D),
In a recumbent position, the acromion sinks into (D),
Improved mattress. An improved bedding for reducing physical stress at bedtime which has a generally vertical rectangular flat shape of a type to be used adjacent to a pillow on an underlay mat or bedding and a floor surface and has a certain thickness. :
(I) When the body is rolled to the left or right from the lying supine position on the longitudinal center line XX of the vertically long rectangular body to the left or right, and then turned to the lying position, the lower body shoulders to the upper arms when lying down. Having symmetrical pockets (A, A) that can be accommodated in a state in which the portion is substantially depressed,
(Ii) A state in which both upper edge corners are symmetrically cut off such that the pockets (A, A) leave a back support portion (B) in the shape of a mountain-like plane near the center of the upper edge of the vertically elongated rectangular body. Being formed of
(Iii) a part (D) for supporting the body part from the upper back to the back neck from below is provided in a form further extended along the center line (XX) from the back carrying part (B), Using a pillow adjacent to the extension (D),
(Iv) An improved futon characterized in that the acromion sinks into (D) in the recumbent posture.   The part (D) for supporting the body part from the upper back to the back neck includes from below the at least one block, the block having a lower hardness than the bedding body, and the acromion sinking into the block in the recumbent posture. The improved futon according to claim 1 or 2, wherein 2. The method according to claim 1, wherein the thickness between the back bending point (K _x ) and the pillow is increased in accordance with the degree of the back bending. 3. The improved bedding according to any one of 3.

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