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The best: Back position

Good for: Preventing neck and back pain, reducing acid reflux, minimizing wrinkles, maintaining perky breasts
Bad for: Snoring

The scoop: Sleeping on your back makes it easy for your head, neck, and spine to maintain a neutral position. You’re not forcing any extra curves into your back, says Steven Diamant, a chiropractor in New York City. It’s also ideal for fighting acid reflux, Dr. Olson says: "If the head is elevated, your stomach will be below your esophagus so acid or food can’t come back up."

Back-sleeping also helps prevent wrinkles, because nothing is pushing against your face, notes Dee Anna Glaser, MD, a professor of dermatology at Saint Louis University. And the weight of your breasts is fully supported, reducing sagginess.

Next: Back sleepers: Consider this