Position 1: The fetal position
The fetal position refers to the position that involves bowing the head forward, arching the back, bending at the hips, and flexing at the knees, which is particularly unhealthy because of how many parts of the body can be negatively affected. Sleeping in this position for an extended period can increase a person’s risk of developing the following issues:
- Knee pain as the ligaments around the knees and hips become inflamed due to the constant flexion occurring at those joints.
- Inflammation and pain in the lower back owing to the back’s curvature when in this position, which leads to the back muscles being stretched and becoming tight.
- Spinal deformities
- Neck pain caused by inflammation resulting from continuous flexion of the neck muscles which leads to those muscles tightening up, and which also places greater pressure on the upper spinal column.
- For patients with a herniated disk, sleeping in an unhealthy posture such as the fetal position could exacerbate the pain.
Position 2: Sleeping on your front
Sleeping on your front is considered unhealthy because it can inhibit breathing and cause irregular curvature of the spine. The turning of the head to one side when sleeping in this position is another cause of such a curvature. All of this can lead to inflammation and pain in the neck muscles in addition to back pain. Lying on your front to sleep is therefore not recommended, although if you must sleep in this position, only do so for short periods, with a pillow underneath the chest or abdomen advised to increase comfort.
Position 3: Half sitting and half lying down
Assuming a half sitting, half lying position with a pillow used to support the lower back as your bottom rests on the bed or sofa while you play on your phone, read a book, or watch TV often means bending or bowing the neck for extended periods. When done regularly, this can lead to an increased workload being placed on the spine, which can result in pain and swelling at the shoulders, as well as lower back pain caused by the curvature of the spine when sitting in this position.
Position 4: Resting your head on your upper arm
Placing sustained pressure on your upper arm where the radial nerve is located could be caused by resting your head there or by crossing your arms as they rest on a surface, such as the arm of a chair. Should this nerve pressure be sustained for a long period, it can lead to nerve damage. The most common complaint arising from this is called wrist drop, a condition that makes it hard to raise the hand on the affected side. The condition, which is caused by prolonged pressure being placed on the radial nerve, is also known as Saturday night palsy or honeymoon palsy, although most cases are not serious and go away without treatment. Recovery times differ from case to case, but the condition usually improves within approximately 3–4 weeks. During this recovery time, doctors may advise patients to carry out some exercises to strengthen the wrist, hand, and forearm muscles to prevent muscular atrophy and any ceasing up of the wrist joint that may otherwise occur. Saturday night palsy or honeymoon palsy got its name from heavy drinkers who would end up falling asleep at a table in the pub with their head resting on their upper arm and from people in a new relationship who would let their partner fall asleep with their head resting on their upper arm, only to wake up with wrist drop and unable to lift their hand.