Charles A. Czeisler, MD, PhD, is Chief of the Division of Sleep and Circadian Disorders at Brigham and Women's Hospital (BWH).
Beware of Blue Light Before Sleep
The use of light-emitting electronic devices before bedtime can negatively impact health, alertness and the circadian clock, which synchronizes the daily rhythm of sleep to external environmental cues.
A Link Between Insomnia and Depression?
People with insomnia are twice as likely to develop depression compared to those without insomnia.