Does sleeping with a pillow between your knees actually improve comfort or pain?

Yes, sleeping with a pillow between your knees generally improves comfort and reduces pain, particularly for side sleepers. Here’s why and how it works: Mechanism: A knee pillow helps maintain spinal and hip alignment by preventing the top leg from pulling the pelvis forward, keeping the hips stacked and the lumbar spine in a neutral curve. It also reduces pressure between the knees and alleviates strain on the lower back and sciatic nerve. Benefits: This practice can ease lower back pain, hip discomfort, knee pressure, and sciatica while enhancing overall sleep comfort and reducing nighttime numbness. Key Beneficiary Groups: Side sleepers with chronic lower back pain, hip flexor tightness, spinal disc problems, sciatica, or pregnancy often benefit the most. Back sleepers, on the other hand, may find relief by placing a pillow under (not between) their knees. Research: An MRI study published in Osteoarthritis and Cartilage confirmed that side sleepers with a knee pillow maintain better spinal alignment. While there are no large-scale randomized controlled trials, multiple clinical observations and expert reviews consistently report reduced pain and improved sleep onset. Practical Tips: Choose a medium-firm, contoured pillow for side sleepers or a flatter one for back sleepers. Place it directly between or under the knees, adjust the thickness (4–6 inches is typically optimal), and combine it with a supportive mattress for maximum benefit. Allow 2–3 weeks for your body to adapt. Bottom Line: Most users report improved comfort and reduced pain, but individual results may vary. Those with severe spinal issues should consult a healthcare professional.