Are You Sleeping Too Much?
The Danger of Sleeping Too Much
The brain benefits of deep sleep -- and how to get more of it | Dan Gartenberg
REM Sleep - How Much Sleep Do You Need
REM Sleep Disorder
Too much REM sleep: why do depressed people wake up exhausted? | Human Givens
What Happens To Your Body And Brain If You Don't Get Sleep | The Human Body
What happens when we sleep?
Sleep: What's REM Got to do With It
Insomnia: why can't I sleep?
How much sleep do you really need? | Sleeping with Science, a TED series
Seen At 11: Chronic Nightmares Could Mean Serious Health Problems
What causes insomnia? - Dan Kwartler
Can You Get Too Much Sleep?
Mayo Clinic Minute: What are the stages of sleep?
What Happens to Your Body on Little Sleep?
Can You Sleep Too Much? (The Answer Might Surprise You)
How Sleep Affects Your Brain
REM Sleep behavior disorder
Dr. Matt Walker: The Science & Practice of Perfecting Your Sleep