2.9. Sleep
SE, insomnia, Insomnia
Symptoms of insomnia was measured by the Insomnia Severity Index (ISI) [Sleepiness was measured by the EPWORTH scale [Objective sleep was measured by an accelerometer (GT3X, TheActiGraph, Pensacola, FL, USA) over 7 nights [Sleep quantity parameter was:Total Sleep Time (TST, min): duration between falling asleep and waking up, not including wakefulness periods.Sleep quality parameters were:Sleep Efficiency (SE, %): ratio of total sleep duration to duration in bed;Wake After Sleep Onset (WASO, min): total time awake after sleep onset. For a better understanding, WASO was expressed as a function of TST: WASO/TST × 100 (%);Sleep Latency (SL, min): refers to the duration for a subject to fall asleep, between the time of bedtime, reported by the participant, and the moment when the subject was asleep, reported by the algorithm.