Origin of circadian
Examples from the Web for circadian
Bright light is what keeps our circadian rhythms in good order.Fight Seasonal Affective Disorder With This New Tracker|DailyBurn|November 7, 2014|DAILY BEAST
Lighting signals your body's circadian rhythm and can have a strong effect on your mood.
“One of the most important things you can do for your sleep is to have a routine to keep your circadian rhythm normal,” says Suh.