When you don’t sleep, eat crap, don’t exercise, and are living off adrenaline for too long, your performance suffers. Your decisions suffer. Your company suffers.
It’s pretty simple: Hard things are valuable; easy things are not so valuable. Reaching the mountaintop is rewarding because it is hard. If it was easy, everybody would do it.
Say no to most things: Features. People. Partnerships. “Coffees.” Projects. Only a few of them really matter. (Yes, it’s hard to know which.) Don’t get distracted.