The brain benefits of deep sleep -- and how to get more of it | Dan Gartenberg
Mastering the Art of Sleep: Finding the Perfect Balance of Deep, Light, and REM Sleep
How to Get More REM Sleep
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How to Get Deep Sleep | Deep Sleep Tips | Are You Getting Enough Deep Sleep
What Happens To Your Body And Brain If You Don't Get Sleep | The Human Body
What causes insomnia? - Dan Kwartler
Insomnia: why can't I sleep?
REM sleep critical for emotional and mental health
Too much REM sleep: why do depressed people wake up exhausted? | Human Givens
How to Get More Deep Sleep!
What's REM Sleep - How Much Do You Need?
What happens when we sleep?
"Get Quality and Sufficiently Long Deep Sleep" by Dr. Andrew Huberman
A walk through the stages of sleep | Sleeping with Science, a TED series
REM sleep: is too little REM sleep DANGEROUS?!
How lack of sleep affects health and tips for a good night's rest
How much sleep do you really need? | Sleeping with Science, a TED series
Are you Getting Enough Deep Sleep?
6 tips for better sleep | Sleeping with Science, a TED series