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 much sleep do you really need? | Sleeping with Science, a TED series
REM Sleep - How Much Sleep Do You Need
Mayo Clinic Minute: What are the stages of sleep?
Are you Getting Enough Deep Sleep?
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How Much Sleep Do You Need? - Professor Of Neuroscience, Russel Foster
2-Minute Neuroscience: Stages of Sleep
REM Sleep Disorder
How to Get Deep Sleep | Deep Sleep Tips | Are You Getting Enough Deep Sleep
How many hours of sleep a night do I need?
Are You Sleeping Too Much?
Dr. Matt Walker: The Science & Practice of Perfecting Your Sleep
A walk through the stages of sleep | Sleeping with Science, a TED series
How to Get More REM Sleep
The Danger of Sleeping Too Much
Sleep 5: Types of Sleep and Sleep Cycles
Stages of Sleep - non-REM, REM, Sleep Studies
What's REM Sleep - How Much Do You Need?