Sleeping on the left side may benefit people with GERD, but it may have negative effects on the heart. However, more research is needed to support these theories.

The positions you sleep in at night may affect your health.

For example, sleeping face-up with a pillow under your back may help with back pain, but it may also worsen symptoms of sleep apnea. Sleeping on your side may be better for sleep apnea, but you may…