alzheimer's disease, Rapid eye movement sleep

We ask an expert why REM sleep is so important, what happens if we don't get enough of it and how to get more REM sleep.
In the late 1800s scientists began to interrogate the neurological basis of dreams. That changed in Sigmund Freud’s time but ...
A sleep expert details why you wake up groggy from a nap and how to make the most of your snack-sized slumber.