The friend who stayed up to drive you home at midnight was trading their sleep for your safety. Remember that.

Favors have a price, and the price is usually paid somewhere you do not see. Someone was already in bed, got up, drove out in the dark, drove back, and then got up for school anyway on four hours. You got home safely, which felt like a lift. For them it was a whole night rearranged.

Say thanks for the sleep, not just the ride, because naming the actual cost is what makes it land. Then set yourself up to return it: keep your phone charged, keep a bit of gas money aside, and be the one who answers at midnight.