There is no single sleeping position that is best for everyone. The most suitable position depends on body shape, existing health conditions, any symptoms experienced during sleep, and the support provided by the mattress and pillow. In general, back and side sleeping are often considered balanced options because they can help keep the spine in a more neutral position. However, sleeping on the back may worsen snoring or sleep apnoea symptoms in some people, while side sleeping can place more pressure on the shoulders and hips. For this reason, it is more useful to consider how comfortable a person feels in a particular position and how they feel on waking rather than focusing only on the position itself.
For a sleeping position to be comfortable and supportive, the mattress and pillow also need to suit that position. When sleeping on the side, an excessively firm mattress may create pressure around the shoulders and hips, while a mattress that is too soft may allow the pelvis and lower back to sink too deeply. Back sleepers generally benefit from balanced support around the lower back and a pillow of suitable height. For stomach sleepers, prolonged rotation of the neck and an increased curve in the lower back may create discomfort. The healthiest sleeping position should therefore be considered in relation to individual needs rather than as a universal rule.
What Are the Benefits of Sleeping on Your Back?
Sleeping on the back can help distribute body weight across a wider surface when the mattress and pillow provide suitable support. This may allow the spine, neck and pelvis to remain in a more neutral position and reduce excessive bending around the lower back and spine. Placing a small pillow beneath the knees may help some people reduce tension in the lower back and support the natural curve of the lumbar region more comfortably. Because the face is not pressed directly into the pillow, some people may also find this position more comfortable for the skin.
However, back sleeping is not ideal for everyone. The tongue and soft tissues around the throat can move backwards in this position, which may increase snoring and can make breathing problems more noticeable in some people with sleep apnoea. People with reflux may also find that lying completely flat on the back is not always comfortable, and elevating the upper body may sometimes be necessary. The benefits of back sleeping should therefore be considered alongside the person’s individual health needs.
Why Is Side Sleeping Often Recommended?
Side sleeping may be more suitable than back sleeping for some people with snoring or certain breathing-related sleep problems. In this position, the tongue and soft tissues around the throat may be less likely to narrow the airway. Side sleeping is also commonly preferred during the later stages of pregnancy. In addition, some people with reflux may experience fewer night-time symptoms when sleeping on the left side. For these reasons, side sleeping is frequently recommended in a range of situations.
For side sleeping to remain comfortable, the shoulders and hips need to sink into the mattress in a controlled way. If the mattress is too firm, pressure can build up around these areas, while an excessively soft mattress may allow the spine to bend sideways. Pillow height is also important because the pillow should fill the space between the head and shoulder and help keep the neck aligned with the rest of the spine. Placing a thin pillow between the knees may also support the alignment of the hips and lower back. The benefits of side sleeping therefore depend not only on the position itself, but also on suitable mattress and pillow support.
Is It Healthier to Sleep on the Left or Right Side?
There is no absolute advantage to sleeping on either the left or right side for everyone. Both sides can be suitable depending on comfort and individual health needs. However, sleeping on the left side may help reduce the movement of stomach contents back into the oesophagus in some people with reflux. This is related to the anatomical position of the stomach and its connection with the oesophagus. During the later stages of pregnancy, side sleeping is also recommended, and either the left or right side can be used; it is not necessary to sleep exclusively on the left.
Sleeping on the right side can also be completely comfortable and appropriate for many people. If there is shoulder pain, hip sensitivity or discomfort on one side of the body, sleeping on the opposite side may feel better. It is also normal to change position naturally during the night rather than remaining on one side continuously. It would therefore be inaccurate to say that the left side is always healthier. The most suitable side depends on the person’s symptoms and the position in which they can sleep most comfortably.
Is Sleeping on Your Stomach Harmful to the Neck and Lower Back?
Stomach sleeping can place additional strain on the neck and lower back in some people. To breathe comfortably in this position, the head is usually turned to one side, which means the neck may remain rotated for a prolonged period. This can contribute to muscle tension and morning stiffness, particularly when a high pillow is used. At the same time, if the abdomen and pelvis sink deeply into the mattress, the natural curve of the lower back may increase and lead to discomfort around the lumbar region.
However, stomach sleeping should not automatically be considered harmful for everyone. Some people have slept in this position for many years without experiencing significant discomfort. Using a thinner pillow, or in some cases no pillow under the head, may help prevent the neck from being raised excessively. Placing a thin support beneath the pelvis may also reduce excessive arching of the lower back. Even so, if a stomach sleeper regularly wakes with neck, shoulder or lower back pain, it may be useful to reassess the sleeping position together with mattress firmness and pillow height.
