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The biggest and most important disruptive factor in your sleep, in fact, is your bed. It is impossible to sleep upright, since you would collapse as soon as your muscles began to relax. Sleeping in a sitting position is possible for shorter periods of time, but gradually the pressure on the back will increase too much.
A supine position is definitely the best and therefore the most universal lying position. In this position, the contact surface with the support is larger, and your muscles relax more,
Beds and mattresses can be found in all kinds of models and materials. But no matter how hard or soft they are, you will always record the pressure from your body and the mattress. Therefore, after lying down for a while, you will automatically dampen the pressure from those areas of the body that are pressed, by turning over.
The pressure on your body depends on your dominant sleep position, your weight, the size of your contact plane, and your firmness.
What we do know is that the plane of contact between the body and the mattress must increase as the body becomes more susceptible to pressure; and therefore the mattress must be more elastic.
Sensing the body too much counterpressure during sleep, you turn around to avoid pressure damage. Turning requires an effort from the structural muscles. Many people already turn around after 10 to 20 minutes when they lie in their dominant sleeping position on a hard surface. Turning in the deep sleep and dream sleep stages interrupts these stages and the time needed to regain muscle relaxation limits and impairs sleep quality.
Even on an extremely elastic bed, you will still register the pressure and turn around, but less often. However, the strongest disturbing factor is a hard mattress. Sleeping on a hard bed not only shortens deep sleep and REM sleep (REM stands for Rapid eye movement), but also causes morning stiffness, shoulder and hip pain, which in turn can lead to neck pain, lower back pain or headaches.
If you get up in the morning and still feel tired, there may be something wrong with your mattress or bed, even if you've never had any physical pain before. The reason may be that you turn around too much, so you get too little of both deep sleep and REM sleep.
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