Created with Sketch. Examples of rare sleep disorders include Kleine-Levin Syndrome (also known as Sleeping Beauty Syndrome), fatal familial insomnia, REM sleep behavior disorder, and idiopathic ...

There are more than 80 types of sleep disorders, including insomnia ... during non-rapid eye movement (non-REM) sleep. Researchers believe that PLMD is linked to restless legs syndrome.

Numerous components beyond length of sleep have important ties to cardiometabolic disease and related risk factors.

The team first trained five monkeys on a task evaluating image orientations and tested them twice, with a 30-minute gap in which they either had non-REM sleep or merely rested. The monkeys that ...