Do you usually sleep on your side? If you want to keep your breasts as perky as possible, you might want to rethink that habit. “Side-sleeping leaves the breasts hanging, so over time it encourages them to sag,” I heard from Christopher Rose, MD, medical director of the sleep center at Covenant Medical Center in Lubbock, Texas.

Sleeping on your stomach isn’t smart, either. It squashes the breasts and promotes wrinkling—not to mention distorting the alignment of your neck and spine.

Best for breasts (and the rest of your body): Sleep on your back, Dr. Rose advised. Exception: Pregnant women should avoid back-sleeping in the later months to keep the weight of the growing fetus off the intestines and major blood vessels (the aorta and vena cava), so that blood flows more freely to the fetus.

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