It might sound crazy: conventional wisdom is that caffeine interferes with sleep. But if you caffeinate immediately before napping and sleep for 20 minutes or less, you can exploit a quirk in the way both sleep and caffeine affect your brain to maximize alertness. Here’s the science behind the idea.

via Scientists agree: Coffee naps are better than coffee or naps alone – Vox.

Scientists agree: Coffee naps are better than coffee or naps alone