Could the temperature of your bedroom influence when you fall asleep, how deeply you sleep, and even the timing of your internal body clock?
For decades, light has been considered the most important environmental signal influencing the human circadian rhythm—the internal biological system that helps determine when we feel awake and when we become sleepy. Morning sunlight helps signal that the day has begun. Darkness in the evening encourages the body to prepare for sleep. Modern sleep advice therefore…
