You probably didn’t know naps fell into different categories, but you can use your naps for a number of different purposes. Planned napping is a nap you take in advance of being tired later. You might have been invited to a late-night party, for example, and take a nap beforehand so you won’t be as sleepy. Emergency napping is when you’re just too sleepy during the day to keep your eyes open and you need a little shut-eye. Finally, habitual napping is a nap that takes place at the same time every day, like a nap after lunch or when you get home from work. All are completely legitimate reasons to nap.