The leading causes of death vary around the world, but some of them have one thing in common: they manifest while the person ...

Sudden cardiac arrest is a common cause of dying in your sleep. Obstructive sleep apnea can raise the risk of dying while sleeping. Heart attacks during sleep may cause chest pain, shortness of breath ...

A tiny group of people needs far less sleep than the rest of us. Geneticists are finally uncovering the mutations that let their brains break the rules.