The Bland–Altman analysis for repeated measures on 10-minute time windows in the awake state (around 7 PM) and during sleep (around 12 AM) was used to compare OHR and HRECG [6]. The Mann–Whitney U-test was used to compare the average HRECG and

颠倒睡眠状态调制心率变异性信号的 功率谱和基本尺度熵分析 -Analysis on power spectrum and base-scale entropy for heart rate variability signals modulated by reversed sleep state.pdf