A-fib occurs when the heart’s upper chambers, called the atria, beat out of sync with the lower chambers, the ventricles.

People across social media claim that dark showering can help reduce stress and aid in sleep. Some experts agree. Learn more here.

Obstructive sleep apnea disrupts brain function in several ways, including low oxygen levels, interrupted sleep, and vascular risk. Several regions throughout the brain may shrink, and the ...

Perpetually waking up at 3 a.m.? Experts share how to address insomnia and sleep more soundly through the night.

Sleep experts explain what winter insomnia is, why colder months can disrupt sleep, and what to do if seasonal changes affect your rest.

It’s rare that people have a disorder where cortisol on its own is the cause. If a person’s cortisol level is chronically low ...

Using an air purifier nightly could improve sleep and reduce blood pressure for some people. Experts recommend choosing a ...

Learn what research tells us about how wearing socks to bed affects sleep and foot hygiene, plus beliefs about socks, sex, ...

Learn the biological triggers of grinding and find medical treatments to protect your jaw and sleep better tonight.

Humans do very little when we sleep. This might not seem like a big deal, until you look to the dolphins as they sleep and swim with the pod. Or fur seals, who can sleep while watching out for sharks.

Do you feel like you spend your nights staring at the ceiling, even though your alarm clock shows a reasonable number of hours of sleep? This persistent fatigue isn't necessarily a sign of a failing ...