I'm like Little Hawk. Naps just don't work for me. I've tried when I felt tired in the afternoon, and ended up waking up feeling worse and decidedly disoriented. Sometimes I wish I could nap but I can't. I find the tired spell passes anyway, especially if I get up and do something active, preferably out in the fresh air. Then when I go to bed, I usually fall asleep quickly and sleep soundly.

On the other hand, John nearly always has a late-afternoon nap. He can wake up quite refreshed after periods of as little as 10 or 20 minutes. so it's horses for courses.