The Basics of Sleep

We discuss the basics of sleep. What is sleep and why do we do it? What happens when you're asleep? What are the different stages of sleep? How does sleep affect physical and mental performance? Are naps bad for you? How does caffeine affect you? Do some people need more sleep than others? Can you sleep with your eyes open? Why do loud noises wake you up and are reddit doctors the best source of information? Do we sleep more or less than other animals? How much sleep do you need?