THE EFFECTS OF INTERMITTENT LIGHT ON SLEEPINESS, SLEEP QUALITY AND SLEEP INERTIA

Abstract

To explore the effects of intermittent light in the evening on sleepiness, sleep quality, and sleep inertia, we compared sleepiness, assessed by KSS, self-evaluated sleep quality using VAS and subsequent sleep inertia measured by KSS, PANAS, PVT, and facial expression recognition task among three conditions of light exposure (for 3 hours): intermittent bright light (30-minute pulse of bright light [~1000 lux] alternating with 30-minute dim light [~5 lux] for three times), continuous bright light, and continuous dim light.