Learn about the key differences between hypersomnia and narcolepsy, their symptoms, treatments, and how they affect daily ...

That might seem like an evolutionary disadvantage, given sleep leaves us immobile and potentially vulnerable to attacks for hours on end — but evidence suggests we have many key physiological ...

It’s like watching a rerun while you’re sleeping: Once again ... or get chased by a shadowy figure. Recurring dreams have a way of popping up again and again. “The dreams contain the ...

A simple way to sharpen your cognition and memory is also an enjoyable one: Take a nap. Research shows that napping can not only take the edge off a night of inadequate sleep but also boost our ...