05/21/2013 04:24 pm ET

Sleep And Couples: For Better Or Worse, Day And Night?

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Sleep.  It occupies about one-third of our lives. We need it for our mental and physical health, and for our survival.

Compared with other health behaviors such as smoking or exercise, sleep is unique because for most adults, it is a behavior they "share" with a partner.  But according to studies funded by the National Institutes of Health and the American Psychological Association, sharing a bed doesn't always produce sweet dreams.

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