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.

Researchers have long divided humanity into two simple camps: the early risers and the late sleepers. You were either a ...

The familiar labels "night owl" and "early bird," long used in sleep research, don't fully capture the diversity of human ...

People typically tend to be either early birds or night owls depending on when they prefer to be awake. Some people feel the most productive early in the morning, and others feel more productive late ...

Being more active in the morning or afternoon is not just a matter of personal preference. Chronotype, which is each person's ...

Add Yahoo as a preferred source to see more of our stories on Google. While it is difficult to fundamentally change your chronotype, it does naturally shift as you age.Composite: Rita Liu/The Guardian ...

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 ...

Do you feel more energized in the morning or at night? Find out why. If the hustle has turned you into an early bird, but you find yourself grumpy and exhausted, this article could shed some light on ...

In order to better understand her circadian rhythm, science journalist Lynne Peeples conducted an experiment in which lived for 10 days in a... Night owl or early bird? Here's how your inner clock ...