Sure, you can use coffee to stay up. But if you’ve got 20 minutes to spare, it may be more helpful to have a cup of joe and then lay down for a power nap. Caffeine actually blocks adenosine, the same inhibitor that causes you to feel tired – and the one that sleep purges from your system. So when you wake up after 20 minutes, the caffeine kicks in at the same time as your passes into REM sleep.
MORE: Coffee naps are better than coffee or naps alone 

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