Health and Medicine Question
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Which of the following is true of the sleep cycle during a night of sleep?
- each non-rem/rem cycle lasts about 45 min
- stages 3 and 4 of slow wave sleep mostly occur in the early morning hours
- as the night goes on, the relative length of rem sleep increases in each subsessive cycle
- subjects first enter rem sleep and then transition to non-rem sleep
- sleep cycles are random across the night