It doesn't mean staying up and waking up late is inherently unhealthy.

Night-owl habits and irregular sleep can disrupt the body's circadian rhythm, raising blood pressure, inflammation and ...

WASHINGTON — Being a night owl can be bad for your heart. That may sound surprising but a large study found people who are ...

A new study of over 300,000 people has a clear message—and it's not just to go to bed earlier.

Staying up late has long been framed as a harmless personal preference, but new evidence suggests it may carry a measurable ...

Did the holidays mess up your sleep patterns? Maybe you stayed up late ringing in the new year, or changed time zones while traveling. Science journalist Lynne Peeples says the body’s circadian ...

People who stay up late are more likely to have heart attacks and strokes than people who go to bed earlier, new research ...

Having different chronotypes, or being more active in the morning vs. afternoon, may play an important role in preserving muscle mass and strength, and metabolic health, according to a new study.

February creates a perfect storm for night owls: limited daylight and the added burden of ‘social jet lag’ layered with ...