There are three main ways to sleep: on your back, on your side, and on your stomach. Of these, lying on your back is said to be the most effective way to relieve fatigue. While lying on your side puts less strain on the body, it also carries the risk of promoting distortion of the body.
Sleeping on your back is effective in relaxing the shoulder muscles and improving blood flow, which helps relieve stiff shoulders. It is important to have the pillow at the right height, and it is recommended to check that when you put your head on it, your eyes are facing straight up so you can breathe easily, your neck is supported firmly by the pillow, and your shoulders and shoulder blades are in close contact with the mattress.
When you lie on your back, your entire body weight is supported by your back, so you can maintain a stable sleeping position with less strain. Your limbs can move freely and your body fluids circulate well, so it is said that muscle stiffness is reduced . It can also be expected to be effective in improving or preventing slouching .
It is important to remember that the optimal posture will vary from person to person, as different individuals have different breathing comfort and physical requirements.