| http://www.w3.org/ns/prov#value | - The sleep-wake cycle is an example of a ___________ rhythm ??? ??? ??? about 1 and 1/2 hours How long is a typical sleep cycle, in which a sleeper progresses through some or all of the sleep stages? ??? ??? ??? 25% Adults spend about ______% of their sleep in REM sleep. ??? ??? ??? Stage N3 The deepest level of sleep is ??? ??? ??? difficulty breathing during sleep Which of the following defines s
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