If you find yourself choosing between working on the problem and taking a nap, always take the nap. (Given the choice between remaining in bed, and taking another peek at the problem, usually take a peek at the problem, after which you should do what feels best.)
Some experimentation should convince you that this is how human minds work (well, most of 'em, and yours is probably one of them), after which you can employ this strategy without guilt during a crisis.
Some experimentation should convince you that this is how human minds work (well, most of 'em, and yours is probably one of them), after which you can employ this strategy without guilt during a crisis.