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
What's REM Sleep - How Much Do You Need?
A walk through the stages of sleep | Sleeping with Science, a TED series
Mayo Clinic Minute: What are the stages of sleep?
How much sleep do you really need? | Sleeping with Science, a TED series
2-Minute Neuroscience: Stages of Sleep
Is This the Weirdest Cat Naps Ever?
How to Get More REM Sleep
REM sleep vs. deep sleep and their importance for cardiovascular and emotional health | Matt Walker
Stages of Sleep - non-REM, REM, Sleep Studies
REM Sleep Disorder
How Much Sleep Do You Need? - Professor Of Neuroscience, Russel Foster
Is Too Much REM Sleep An Issue? | Cabral Concept 2336
What happens when we sleep?
How Much Deep, Light, and REM Sleep Do You Need
Too much REM sleep: why do depressed people wake up exhausted? | Human Givens
"Get Quality and Sufficiently Long Deep Sleep" by Dr. Andrew Huberman
Are you Getting Enough Deep Sleep?
Dr. Matt Walker: The Science & Practice of Perfecting Your Sleep