M又分为一期睡眠（stage 1 sleep，S1）、二期睡眠（stage 2 sleep，S2）、三期睡眠（stage 3 sleep, S3）和四期睡眠（stage 4 sleep，S4）等4个睡眠阶段。采用目测法分析睡眠参数，包括①睡眠进程
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For the next half hour or so, as you relax more and more, you will drift down through stage 2 and stage 3 sleep.
在接下来的半个小时左右，随着你越来越放松，你将会进入睡眠的第二和第三阶段。
Results: Patients with OSAHS had sleep structure disturbance obviously. Sleep stage 1and awakening time increased, but stage 3 + 4 and REM sleep decreased obviously. The sleep cycle wasn't sufficient.
结果：OSAHS患者1期睡眠明显增多，3 + 4期睡眠明显减少，REM睡眠减少，夜间醒觉时间明显延长，睡眠周期不全。
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