Not Ideal: Fetal Position

Health.com: Which Sleep Style Is Healthiest?

Good for: Snoring less, sleeping during pregnancy

Bad for: Preventing neck and back pain, minimizing wrinkles, maintaining perky breasts

The scoop: When you snooze with your knees pulled up high and chin tucked into your chest, you may feel it in the morning, especially if you have an arthritic back or joints, Dr. Olson says.

"This curved position also restricts diaphragmatic breathing," adds Dody Chang, a licensed acupuncturist with the Center for Integrative Medicine at Greenwich Hospital in Connecticut. And if you make this your nightly pose, you may bring on premature facial wrinkles and breast sag.

(Terry Doyle)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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Sleep Tight

Your preferred p.m. pose could be giving you back and neck pain, tummy troubles, even premature wrinkles. Discover the best positions for your body—plus the one you may want to avoid.

(Terry Doyle)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

The Best: Back P...

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.

(Terry Doyle)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

Back Sleepers: C...

"Snoring is usually most frequent and severe when sleeping on the back," Dr. Olson says.

Perfect pillow: One puffy one. The goal is to keep your head and neck supported without propping your head up too much.

(Getty Images)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

Next Best: Side ...

Good for: Preventing neck and back pain, reducing acid reflux, snoring less, sleeping during pregnancy

Bad for: Your skin and your breasts

The scoop: Side-sleeping is great for overall health—it reduces snoring and keeps your spine elongated. If you suffer from acid reflux, this is the next best thing to sleeping on your back. The downside: "Sleeping on your side can cause you to get wrinkles," Dr. Glaser says. Blame all that smushing of one side of your face into the pillow.

This pose also contributes to breast sag, since your girls are dangling downward, stretching the ligaments, says Health’s Medical Editor Roshini Rajapaksa, MD.

(Getty Images)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

Side Sleepers: C...

If you’re pregnant, sleep on your left side. It’s ideal for blood flow.

Perfect pillow: A thick one. "You need to fill the space above your shoulder so your head and neck are supported in a neutral position," says Ken Shannon, a physical therapist at Brigham and Women’s Hospital in Boston.

(Corbis)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

Not Ideal: Fetal...

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

Fetal-Position S...

Just straighten out a bit—try not to tuck your body into an extreme curl.

Perfect pillow: One plump pillow—the same as side position, to give your head and neck support.

(Corbis)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

The Worst: Stoma...

Good for: Easing snoring

Bad for: Avoiding neck and back pain, minimizing wrinkles, maintaining perky breasts

The scoop: "Stomach-sleeping makes it difficult to maintain a neutral position with your spine," Shannon explains. It puts pressure on joints and muscles, which can irritate nerves and lead to pain, numbness, and tingling. "Think about the soreness you’d feel if you kept your neck turned to one side for 15 minutes during the day," Dr. Diamant explains.

In this position you have your head to one side for hours at a time. You won’t necessarily feel it the next day, but you may soon start to ache.

(Terry Doyle)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

Stomach Sleepers...

Do you snore? "Stomach-sleeping may even be good for you," Dr. Olson says. Facedown keeps your upper airways more open. So if you snore and aren’t suffering from neck or back pain, it’s fine to try sleeping on your belly.

Perfect pillow: Just one (and make it a thin one) or none at all.

(Corbis)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

Swear You Don't ...

Think again. While you generally spend the most time in the position you fall asleep in, even those who barely have to make their beds in the morning move two to four times an hour, which may add up to 20 or more tosses and turns a night, says Eric Olson, MD, co-director of the Mayo Clinic Center for Sleep Medicine in Rochester, Minnesota. "That’s completely normal, and you’ll still go into deep REM sleep, the restorative kind," he says.

(Getty Images)