Sometimes you just need a nap. Or a good book and then a nap. Or being with a good friend on a sunny day outside with a good book then a nap. Naps are relaxing. You know you feel comfortable with a friend when you can take a nap together.
Also, when the rest of the world seems to be going crazy is a good time for a nap. Sometimes a person can get so tired/frustrated that they aren’t able to think straight or make good decisions – a nap would be appropriate during these times as well. Adults need naps. College students need naps. Why are naps only seen as a necessity for young children? (Maybe the kids should stay up and play and the parent(s) should take the nap?)