Sleep is vital. Think about it: sleep loss causes performance to suffer, but getting plenty of sleep results in better performance. Most people wouldn’t consider going without food or water, and sleep is no different—it’s a necessity. Lack of sleep is equivalent to being drunk. In fact, after being awake for 18–20 hours, you’d function as if you had a blood-alcohol content of .1%, or about four drinks for a 150-pound man.
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