The thirty- to forty-five-minute “power nap” tends to be restorative for most people, so instead you will want the two-hour (or longer) “misery nap” that occupies much of the afternoon. This will leave you feeling groggy and unproductive, and it will make it even easier for you to lie in bed sleepless later that evening.
What about 60-90 minute naps I have most often? Are they healthy or unhealthy?
