circadian rhythm

The American Medical Association says some energy-efficient streetlamps interfere with circadian rhythms and also cause glare. It recommends that towns choose less intense, warmer-colored lights.

We have different clocks in virtually every organ of our bodies. But living against the clock — eating late at night or working overnight — may set the stage for weight gain and chronic disease.

A new study finds that people who read print books at bedtime fall asleep easier — and sleep better — than those who use an e-reader. Also: JRR Tolkien may have survived war due to a timely illness.

Human existence is basically circadian. Most of us wake in the morning, sleep in the evening, and eat in between. Body temperature, metabolism, and…

The effects of a time change can be significant and lasting for both hamsters and humans. Commentator Tania Lombrozo turns to an expert to learn more about circadian rhythms.