I just read Keep on Going by Austin Kleon (via Xander Beattie), and this passage intrigued me:

Me, I like the ‘caffeine nap’: Drink a cup of coffee or tea, lie down for fifteen minutes, and get back to work when the caffeine has kicked in.

So after lunch I tried it. Drank a big cup of coffee. Napped. Then I got up, and, well, felt like absolute heated garbage for the next eight hours. I felt on the edge of both falling asleep and throwing up. This little bio-hack basically crashed my body! I don’t think caffeine works the same for me as it does for other people.