Sleep deprivation is no joke.
Even moderate fatigue can hit you as hard as alcohol intoxication, $4 from the Harvard Business Review.
However, many top executives and leaders seem to swear by skimping on shut eye.
Some of them might be part of the "$4." Others are probably just good at masking the effects of exhaustion.
Unless you're one of those lucky people who doesn't get tired, $4 when it comes to your sleep routine: