The brain benefits of deep sleep -- and how to get more of it | Dan Gartenberg
Too much REM sleep: why do depressed people wake up exhausted? | Human Givens
REM Sleep Disorder
How to Get More REM Sleep
How much sleep do you really need? | Sleeping with Science, a TED series
Are You Sleeping Too Much?
The Danger of Sleeping Too Much
Meditation Sleep Music for Deep Sleep, Stop Overthinking - Calm Down, End Anxiety Attacks
Why you're still tired after getting 8 hours of sleep
What causes insomnia? - Dan Kwartler
How to Get More Deep Sleep!
What happens when we sleep?
How Some People Can Sleep Through Anything
Insomnia: why can't I sleep?
5 Tips For Deep Sleep
Are naps actually good for us? | Sleeping with Science
What Happens To Your Body And Brain If You Don't Get Sleep | The Human Body
What's REM Sleep - How Much Do You Need?
The surprising health benefits of dreaming | Sleeping with Science
2-Minute Neuroscience: Sleep Paralysis