A nurse interviewing a client about sleep patterns is told that the client goes to bed about 11 p.m. and usually falls asleep by 11:15 p.m. The nurse identifies this as which time period?

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Sleep latency is the time period measured from "lights out," or bedtime, to initiation of sleep. Sleep architecture is the pattern of non-rapid eye movement (NREM) and rapid eye movement that are in approximately a 90- to 110-minute cycle. Sleep occurs in stages, and the timing of sleep is regulated by circadian rhythms. Sleep efficiency is the ratio of total sleep time to time in bed. Slow-wave sleep is the deepest state of sleep occurring during stages 3 and 4 of NREM sleep.

A Nurse Interviewing a Client About Sleep Patterns Is Told