If your back hurts or you have cervical osteoarthritis, it is better to sleep with a cervical pillow …

If you have low back pain or sciatica, you can put a cushion under your knees to decrease the stress under your lumbar vertebrae. It is also the recommended position for pregnant women, especially during the last months of pregnancy.

If you have heavy legs, varicose veins or swollen feet, you can put a pillow under your feet, as it facilitates the return of blood to the heart.