Definition: Sleep efficiency is the ratio of time spent asleep (total sleep time) to the amount of time spent in bed.
Examples:
If a man spends eight hours in bed but only sleeps four hours, his sleep efficiency would be 50%.
Sleep Efficiency
By Brandon Peters, M.D., About.com Guide
Updated February 12, 2009
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
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