When you have sciatica, the way you sleep can affect how much strain is placed on your lower back. A supportive sleeping position may reduce pressure, while an awkward position can make symptoms worse.

The source article recommends sleeping on your back or side when sciatica is painful. Sleeping on your stomach is best avoided because it can increase the arch in the lumbar spine and place more stress on the lower back.

Even when sleeping on your back or side, however, an unsupported position may increase pressure on the muscles around the buttocks and thighs. Staying in exactly the same position for too long can also make the muscles feel stiff, so changing position occasionally may help.

Back sleeping can be comfortable for some people with sciatica, but the position of your legs and lower back matters.

Avoid lying flat with both legs completely straight. This position can increase pressure from the buttocks through the backs of the thighs and calves.

It can also extend the hips and increase the arch in the lower back, potentially worsening lower back pain. The source article also advises against placing a cushion or towel directly beneath the lower back.

When sleeping on your back, try keeping your knees bent. Rather than consciously holding the knees up while you sleep, place a soft cushion or pillow beneath them for support.

Using a soft cushion where it contacts the legs can also help reduce pressure.

Side sleeping can place relatively little strain on the lower back, but the lumbar spine has less support in this position and may bend sideways. Proper positioning can therefore make a difference.

When sleeping on your side, avoid letting the upper leg fall far forward. This may pull on the muscles and sciatic nerve from the buttocks down toward the calf.

It can also twist the hip and leg, potentially increasing strain and worsening lower back pain.

The source article recommends lying with the painful side facing upward, gently bending the hips and knees, and slightly rounding the upper body.

Place a cushion or folded towel between the legs to prevent the upper leg from falling forward. If the natural curve at your waist leaves the lumbar spine unsupported, a thin folded towel or soft support around the waist may help fill the gap.

A body pillow can also help stabilize your position and reduce the need to tense the lower back while sleeping.

Sciatica is a general term for pain, numbness, or other symptoms affecting the lower body due to an underlying condition. Symptoms can extend from the lower back into the buttocks, legs, and feet.

Because several different conditions can cause sciatica, consider medical evaluation if you are concerned about ongoing or severe symptoms.

A lumbar herniated disc is one possible cause of sciatica. Part of an intervertebral disc protrudes and compresses a nearby nerve, leading to pain or numbness.

Posture, movement patterns, physical characteristics, bone structure, and age may all be associated with the condition.

Lumbar spinal stenosis can also cause sciatica. The spinal canal becomes narrower and compresses the nerves inside it.

A characteristic symptom described in the source is pain while walking that becomes easier after resting.

Piriformis syndrome occurs when the piriformis muscle, which lies close to the sciatic nerve, becomes tight and places pressure on the nerve.

Sports, prolonged sitting, and physically demanding work are among the factors that may cause the piriformis muscle to become tight.

Some causes of sciatica are difficult to identify without professional assessment. Avoid relying only on self-diagnosis, especially when symptoms persist or worsen.

If sciatica is keeping you awake, adjusting your sleeping position may help reduce stress on the lower back and legs.

Try supporting your knees when lying on your back or keeping your legs gently bent with a cushion between them when sleeping on your side. The goal is to find a position that reduces pressure without forcing your body into an uncomfortable posture.

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Source references in the original article: MSD Manual Consumer Version, “Sciatica”; Japanese Orthopaedic Association, “Lumbar Spinal Stenosis.”

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