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
REM Sleep - How Much Sleep Do You Need
How much sleep do you really need? | Sleeping with Science, a TED series
What's REM Sleep - How Much Do You Need?
REM sleep vs. deep sleep and their importance for cardiovascular and emotional health | Matt Walker
Too much REM sleep: why do depressed people wake up exhausted? | Human Givens
Mayo Clinic Minute: What are the stages of sleep?
Chaotic Sword God: The Rise of a Fallen Prodigy
How Much Sleep Do You Need? - Professor Of Neuroscience, Russel Foster
2-Minute Neuroscience: Stages of Sleep
"Get Quality and Sufficiently Long Deep Sleep" by Dr. Andrew Huberman
Are you Getting Enough Deep Sleep?
What happens when we sleep?
How Much Deep, Light, and REM Sleep Do You Need
Why you're still tired after getting 8 hours of sleep
Stages of Sleep - non-REM, REM, Sleep Studies
Dr. Matt Walker: The Science & Practice of Perfecting Your Sleep
How Some People Can Sleep Through Anything
2-Minute Neuroscience: Sleep Paralysis