A nurse is interviewing a client about his sleep patterns. He tells the nurse that he goes to bed about 11 p.m. and usually falls asleep by 11:15 p.m. The nurse identifies this time period as which of the following?
A) Sleep latency
B) Sleep architecture
C) Sleep efficiency
D) Slow-wave sleep
Ans: A
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.
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