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Have you heard about a 'Caffeine Nap'?

Research suggests that when you are feel tired, slow and sleepy during the day - it would be ideal to take a 'Caffeine Nap'. Basically drink Coffee (or any caffeinated drink of your choice) and immediately take a 15-minute nap. Caffeine takes more than 15-18 minutes to kick in passing from your stomach through your small intestine to the bloodstream to reach the brain - till then your brain uses up and clears out adenosine a neuromodulator that makes you feel sleepy and when you wake up the caffeine molecules get attached to the adenosine receptors (caffeine molecule is similar to adenosine) making you feel energized and alert.

Recommended reading

How to optimize caffeine? - Source: fastcompany.com How Caffeine works is very well explained...

Caffeine Naps? - Source: psychologytoday.com