Close the Blinds (04-18-22)
The Mason team’s findings support calls to keep light levels low in spaces where people are sleeping. The group reports that their “laboratory study shows that, in healthy adults, one night of moderate (100 lx) light exposure during sleep increases nighttime heart rate, decreases heart rate variability (higher sympathovagal balance), and increases next-morning insulin resistance when compared to sleep in a dimly lit (<3 lx) environment.