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Sleep efficiency

Sleep efficiency (SE) is the ratio between the time a person spends asleep, and the total time dedicated to sleep. It is given as a percentage. SE of 80% or more is considered normal/healthy with most young healthy adults displaying SE above 90%. SE can be determined with a polysomnograph and is an important parameter of a sleep study.

Clinical significance
Long sleep duration may be a sign of low sleep efficiency. SE is significantly reduced in insomnia; SE is therefore an important clinical parameter in clinical investigations of insomnia. Furthermore, lower values of SE are often observed in sleep studies on pregnant populations and are mostly explained by the increased awakening periods after sleep onset (wake after sleep onset (WASO)). == References ==
Source: Wikipedia ↗
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