A report by the Wall Street Journal reveals that 34% of the American-adult population takes a nap on a daily basis. The study also reveals that the time spent napping could be an indication of someone not receiving sufficient sleep and trying to make up for it.
Sleep patterns are measured in 90-to-120-minute cycles. The article also offers the advice that a power nap lasting between 10 and 20 minutes could be ideal for that quick pick up, recharge, and get back to it that comes in handy about three-quarters through the day. According to the WSJ, shorter naps are better than long ones.
…Those who took 20- and 30-minute naps tended to feel groggy immediately after the nap for up to about 30 minutes. From there, they showed mental sharpness similar to what researchers saw from the 10-minute nappers, with that sharpness lasting a bit longer.