Many cultures practice some sort of an afternoon break. In Mexico, it is “siesta”. In England it’s “Tea Time”. In northern European countries, it’s “Coffee Time”. Call it what ever you want to, but take a break in the afternoon. A little treat with your break will boost you up to make your afternoon more effective. One piece of cake, a couple of cookies, or some fruit is great. It’s not a full meal. -- And for that matter, you should also practice “Elevenses” (a morning break).