Yes. I do 20 minutes of nap most afternoons, and it helps immensely. Though "nap" is a misnomer, I don't actually try to sleep, just sit or lie comfortably with my eyes closed and as few noises and interruptions as possible. A 20 minute timer has taught my body to get ready to work again after exactly 20 minutes. The goal is to let the mind relax for a bit.