The effects can be powerful enough, governments should consider regulating lights in casinos.

"The study shows that our biologically hardwired seasonal timing affects how we adjust to changes in our daily schedules."

Waking up early may help you to adjust faster though.

Insomnia and bad sleep can lead to high blood pressure and increase hormone levels and inflammation.

The current system − daylight saving time and early school start times − wastes billions while causing more car accidents, workplace injuries and health issues.

A one-hour adjustment to the clock on the wall may not sound dramatic. But our biological clock begs to differ.

Opioids and other addictive drugs can alter the rhythmic activity of genes involved in sleep-wake cycles.

An expert digs into how our circadian system works, its far-reaching influence on health, and how to keep it running smoothly.

New research finds connections between mood and circadian rhythm disruptions in a study using Fitbit data from hundreds of medical interns.

Brain cancer has an internal clock and syncs its daily rhythms to match—and take advantage of—the rhythms of its host.