The brain benefits of deep sleep -- and how to get more of it | Dan Gartenberg
How to Get More REM Sleep
REM Sleep Disorder
Mastering the Art of Sleep: Finding the Perfect Balance of Deep, Light, and REM Sleep
Too much REM sleep: why do depressed people wake up exhausted? | Human Givens
"Get Quality and Sufficiently Long Deep Sleep" by Dr. Andrew Huberman
Sleep: What's REM Got to do With It
Are naps actually good for us? | Sleeping with Science
What Happens to Your Body on Little Sleep?
Insomnia: why can't I sleep?
What Happens To Your Body And Brain If You Don't Get Sleep | The Human Body
A walk through the stages of sleep | Sleeping with Science, a TED series
What happens when we sleep?
REM Sleep - How Much Sleep Do You Need
REM Sleep behavior disorder
What causes insomnia? - Dan Kwartler
How lack of sleep affects health and tips for a good night's rest
How Sleep Affects Your Brain
How Some People Can Sleep Through Anything
The Danger of Sleeping Too Much