I am retired now, but when I was working in Asia I often took a twenty- to thirty-minute nap followed by a big jolt of coffee or tea or an energy drink. My favorite place for a kip was in the shade of the building in which I worked (It was on pilings so there was a gap under it.) The newspaper delivery guys for the publishing group that employed me napped on beach loungers in this cool and gloomy underbelly. There were almost always a few free loungers. And I would catch thirty minutes on one and then buy a coffee from a street vendor and then head back upstairs. Completely fantastic rejuvenation even though I didn't think to drink the coffee beforehand.
We spent a lot of time at the office, but as long as we met deadline on our assignments no one, not even our Simon Legree of a boss, begrudged us a nap.
Winston Churchill was a great proponent of naps. And he maintained that they allowed him to work his brutal schedule during WW II. He advised not to mess about with such a serious undertaking. Out of your kit and into some PJs and into bed if you can manage.