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How to avoid messing up your sleep cycle when the clocks go forward, according to a sleep scientist

The clocks spring forward by an hour on March 25, which can disrupt our sleep cycles more than you might think.

Night owls have a higher risk of dying than morning people, according to a study of nearly half a million people

Being a night owl comes with a range of health risks, including heart disease, obesity and smoking, psychiatric disorders, and a 10% increased risk for death.

There’s a scientific explanation for why you’re a morning person or night owl — but it’s possible to reset your internal clock...

We're not all meant to be early risers. Preferred waking time can be adjusted to some degree, but everyone's internal clock is different.

Biological factors determine whether you’re a morning person or night owl — this scientific quiz tells you where you fit on the spectrum

There's a lot of scientific research into how our internal body clocks, or chronotypes, are defined — and how they influence our lives.

How to reset your body clock for daylight-saving time and jet lag, according to science

We all have a natural internal clock: our circadian rhythm. It makes us feel tired when it's time to sleep and wakes us up on a schedule. And it can be changed.

How to know if you got a good night’s sleep

The National Sleep Foundation assembled a group of experts and examined hundreds of studies to figure out how to tell when you actually got enough sleep.