| 单词 | sleep cycle | 
| 释义 | sleep cycle The sleep cycle runs in 90- minute periods.   Survive the Nine to Five - a woman's guide to working well (1989) That can certainly interfere with their sleep cycles.   Times, Sunday Times (2014) So plan bedtime so that you wake up at the end of a sleep cycle not during one.   The Sun (2016) | 
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