Sleep Health

Light is the single most powerful environmental cue that regulates human sleep. It shapes our circadian rhythm, influences hormones like melatonin and cortisol, and determines how easily we fall asleep, stay asleep, and feel alert the next day. Evidence from multiple research studies shows that timing, intensity, and type of light exposure play a critical role in sleep quality. Light and the Body’s Internal Clock The human brain has a “master clock” in the suprachiasmatic nuc