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> ...it takes around 20 minutes for the caffeine to get through your gastrointestinal tract and bloodstream anyway.

This isn't really true, right? On an empty stomach a strong coffee seems to get me high as a kite in about two minutes.

I've been doing this coffee+nap thing for a long time. It definitely works for me. My trick for falling asleep reliably and quickly is listening to an audiobook.

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There is a lot of it depends. On an empty stomach 20 minutes does seem a bit long.

However you're also conditioned to the feeling you expect coffee to provide, so the initial jolt of energy may have almost nothing to do with the actual caffeine and more to do with the thought of the caffeine.

How do you drink your coffee? If you sugar it, you're not dealing with just the caffeine.

I don't but how would sugar beat caffeine into the blood stream?

Absorption of some nutrients happens in the mouth and gums. Perhaps the poster is speculating that sugar (simple carbs?) molecules might be quickly absorbed into the bloodstream through the mouth and esophagus while caffeine has to be digested in the stomach?

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