If this position of raising your hand while sleeping feels comfortable... there may be a problem with your spine.

There are people who habitually raise both arms above their head like a salute when they sleep. However, this position is not good for the spine.

Repeatedly sleeping in a state of breath-holding can lead to thoracic outlet syndrome.

Thoracic outlet syndrome is a condition where nerves and blood vessels passing through the thoracic outlet are compressed due to various causes, resulting in arm pain. When lying down and raising the arm as if to salute, the brachial plexus and blood vessels passing under the clavicle can be compressed, disrupting blood circulation.

There is a risk of developing shoulder impingement syndrome, where the shoulder blade and tendons rub against each other every time you move your arm.

If you stay with your arms raised for a long time, the rotator cuff tendon in the shoulder can collide and become inflamed. People who frequently perform tasks that involve raising their arms, such as ceiling wallpapering, or who have shoulder conditions in general, need to be especially cautious.

If the Mansa posture is comfortable, there may already be an abnormality in the spine, most notably caused by 'thoracic kyphosis.'

Kyphosis is a condition where the spine is excessively curved backward. When kyphosis is present, raising the arms temporarily straightens the hunched back, providing a feeling of relief. In such cases, there is a high likelihood of frequently adopting prone or crouched postures. Additionally, shortened muscles in the neck and chest can compress blood vessels and nerves beneath the collarbone, leading to pain, which may suggest thoracic outlet syndrome.

Thoracic outlet syndrome occurs when there is prolonged poor posture such as a turtle neck position or excessive burden on the shoulders and neck due to carrying heavy loads.

Therefore, you should also try to maintain proper posture while sleeping. The best position is lying flat on your back with your back against the floor.

Lying down immediately after looking at the ceiling helps keep the spine in a straight line and prevents unnecessary pressure on the back or joints. Next, lying on your side is recommended. Especially for those who snore loudly, sleeping on your side can help open the airway. It is also beneficial for relieving pain in people with a herniated disc. However, during this position, placing a pillow between the legs can prevent unnecessary pressure on the lower back.

The posture to avoid the most is sleeping face down. 

Lying face down can cause the hips and spine to bend upward toward the ceiling, putting strain on the neck to lower back and potentially causing pain.