Walker makes strong arguments that you need a minimum of 8. He doesn't give much leeway. I've been fretting every time I get 7 hours of sleep for the past few m

Walker makes strong arguments that you need a minimum of 8. He doesn't give much leeway. I've been fretting every time I get 7 hours of sleep for the past few months and try to make it up with naps in the day, even if I don't feel tired.