Why would you: Although it is commonly stated that slow wave sleep (stage n3 sleep, stage 3/4 sleep, delta sleep) is needed for sleep to be refreshing, there is no evidence to show that. The amount and continuity of sleep is more important than what stage and how much time in each stage (except that too much time in stage n1 might not be as refreshing).
Answered 8/5/2015
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A doctor has provided 1 answer
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