If we didn't need eight hours of sleep and could survive on six, Mother Nature would have done away with 25 percent of our sleep time millions of years ago. Because when you think about it, sleep is an idiotic… — Matthew Walker Copy Share Image
I heard endless conversations between my parents when I was going to sleep about how we would survive, how we would continue. All of them were about trying to make me better. — Maria Sharapova Copy Share Image
