Case 1: Used the toilet in the middle of the night, left the toilet with very little toilet paper left. Next morning, was the first to use the toilet (big business), with that bit of toilet paper left. Therefore, don’t do to people what you don’t want to do to yourself.
Case 2: Ate excessively, ended up with a bloated stomach for the entire night, resulting in insomnia and stomachache the next morning. Therefore, take/eat only what you need.