After experiencing your first and second periods of deep sleep, your body enters wakeful sleep stages, like REM sleep or light sleep, which makes you vulnerable to common sleep disruptions.
经历了第一和第二个深度睡眠期后,身体进入到了清醒的睡眠阶段,比如说快速眼动睡眠或浅睡眠,这会让你易受到常见的睡眠干扰的影响。