Nap architecture.

Means and Standard deviations. Sleep duration and Sleep Latency are expressed in minutes. Total Sleep Time during the Nap (Nap TST). WASO – Wake after sleep onset.均值与标准差。睡眠时长（Sleep duration）与睡眠潜伏期（Sleep Latency）均以分钟为单位。小睡总睡眠时间（Nap TST）。WASO——睡眠起始后觉醒时长（Wake after sleep onset）。