If your back, neck, or shoulders feel stiff every morning, your sleep posture may be the cause. Dr. Andrew Bang, a chiropractor at the Cleveland Clinic in the United States, outlined pain prevention principles for each sleeping position, emphasizing that maintaining a neutral posture that preserves the spine's natural curve during sleep is key.
Dr. Bang defined sleep as a time when stress accumulated in muscles, ligaments, and joints during the day is released. He explained that poor posture, if it becomes a habit, can deform ligaments and bone structures.
Back sleeping is the most common position but one where alignment easily breaks down. The chin should not be tucked in, and the face should look straight up to reduce strain on the cervical spine. Lowering the head causes "turtle neck" pain. Placing a pillow between the knees when side sleeping prevents the upper leg from falling forward, helping maintain hip and spine alignment. The thighs should be parallel to the torso, with the knees only slightly bent. A curled-up fetal position adds pressure to the spine and joints. Sleeping on only one side creates musculoskeletal imbalance, so alternating sides is recommended. A pillow should be thick enough to keep the head and neck from drooping.
Back sleeping places the least pressure on the spine. Placing a pillow under the knees maintains the lumbar curve and reduces strain on the lower back. For people with tight hamstrings, fully extending the legs can cause the lower back to arch excessively, making this measure effective. Pillow height should be chosen so that the chin remains in a neutral position, not bent toward the ceiling or chest.
Stomach sleeping is the only position Dr. Bang does not recommend. Continuous pressure is applied to both the cervical and lumbar spine. He said most patients who visit clinics for sleep-related pain habitually adopt this position. If completely breaking the habit is difficult, placing a thin pillow under the abdomen can help reduce spinal pressure.
The direction of gravity must also be considered. Even when sleeping on the back, drooping shoulders place strain on the rotator cuff. Placing a folded blanket or low pillow under the arm keeps the shoulder horizontal with the torso. When sleeping on the side with the painful shoulder facing up, the arm should be supported with a pillow. Sleeping on the stomach with the painful arm tucked under a pillow worsens rotator cuff damage.
Stretching before bed loosens stiff muscles and prevents nighttime cramps. An evening shower shifts the body into a recovery state through changes in body temperature. Maintaining an appropriate room temperature can reduce tossing and turning during sleep. Dr. Bang advised testing different postures and pillows to find what works, while immediately avoiding any position that causes pain.
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