Qidane wrote, "A few minutes of nap brings several hours of high efficiency, but how to scientifically nap to a higher level? * 1 First, in terms of psychology: realize that it's not because you're lazy; napping will make you more efficient and agile. * 2 Try to nap in the morning or after lunch; the body's biological clock makes it easier to fall into deep (slow wave) sleep in the afternoon. * 3 ........................."