Wondering how to prepare for sleep disruption? Should you take melatonin or other sleep aids? Here's answers from researchers and seasoned travelers — including NPR's international correspondents.
Call it "precision waking" — the alleged ability to decide when you want to wake up and then doing so, without an alarm. If you think you can do it, you're not alone, though how is still mysterious.
We mark our days by sunlight, with special receptors in our eyes that respond to light and help reset our body clocks each day. This man can't see, but is still a circadian wiz. Here's how.
Just a night or two of exposure to faint light is enough to raise your pulse and increase insulin resistance — factors that increase the risk of heart disease and diabetes, researchers find.
Every cell in our bodies has a well-tuned timing mechanism. So, when we "fall back" or "spring forward," it takes us time to adjust. We have tips that can help.
Though teenagers need about nine hours of rest a night, most get only seven and are suffering. A new survey suggests their parents are struggling, too. Here's how to improve the quality of teen sleep.
The scientists honored with a Nobel Prize in medicine helped discover that every cell in the body has its own clock. When we ignore those clocks, we increase the risk of weight gain and diabetes.
Living most of life indoors can get your body clock out of phase. A fairly painless way to synch it is to spend a weekend camping, researchers say. Even the dim light of winter will do.
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.
Everyone has a set of genes that keeps the body on a 24-hour rhythm. As we get older, though, the main clock can malfunction. Researchers say a backup clock may try to compensate.