Reminds me of when I interned as a medic. My instructor gave me a list of rules:
Walk, don't run.
Never trust the public in a vehicle.
Always check the rigging yourself before rapelling down the embankment.
Sleep when you're tired.
Eat when you're hungry.
And never, I repeat, NEVER wait to pee.
When you live in a world where you may have to scramble at any moment, and you work 72 hour shifts, you can't take simple things for granted. We might go from chilling on base to not being back for 15+ hours.
No one really regrets going to the bathroom when it isn't urgent.
Plenty of people regret waiting until it gets urgent.