People differ and people's bodies differ, but the trick seems to be to take a break from the focused work-related activity. Many people (including many comments

People differ and people's bodies differ, but the trick seems to be to take a break from the focused work-related activity. Many people (including many comments at the link) report an after-lunch walk being quite refreshing. At one of my previous jobs we used to play table tennis whenever we needed a break. I personally prefer longer bursts of sleep, 1 hour does not do much for me, but walking or exercising does. Even shopping! YMMV.