The brain benefits of deep sleep -- and how to get more of it | Dan Gartenberg
REM Sleep - How Much Sleep Do You Need
Too much REM sleep: why do depressed people wake up exhausted? | Human Givens
How much sleep do you really need? | Sleeping with Science, a TED series
How Some People Can Sleep Through Anything
The Danger of Sleeping Too Much
REM Sleep Disorder
What causes insomnia? - Dan Kwartler
Sleep: What's REM Got to do With It
Why you're still tired after getting 8 hours of sleep
How to Get More REM Sleep
Insomnia: why can't I sleep?
What happens when we sleep?
Dr. Matt Walker: The Science & Practice of Perfecting Your Sleep
The surprising health benefits of dreaming | Sleeping with Science
Are You Sleeping Too Much?
How to Stop Waking Up in the Middle of the Night- 6 Ways to Beat Insomnia Without Medication
Mayo Clinic Minute: What are the stages of sleep?
Are naps actually good for us? | Sleeping with Science
How to Get More Deep Sleep!