Translations:Scheduling overview/9/zh-hant

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SWS和REM(統稱為“必要睡眠階段”)是身體最需要的睡眠階段,一般來說不能被削減。當睡眠者沒有得到足夠的SWS或REM時,相應的壓力就會開始積累。隨著壓力的增加,身體會開始偏好於所缺乏的睡眠階段而不是其他。一段時間過後,這可以引起入睡出現之快速動眼期(SOREM)和入睡出現之慢波睡眠(SOSWS),讓身體能夠在更短的時間內獲得所需的SWS和REM。此外,當睡眠受到限制時,必要睡眠階段會取代淺層睡眠(NREM1和2),進一步減少了維持健康所需的總睡眠量。