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> of course, TODAY, my ruined body is so immune to caffeine I can chug coffee directly before a satisfying REM nap lol

Going on a tangent: it takes a while for the caffeine you drink to make it through your digestive system, so even for someone without any tolerance at all, they could take a few shots of espresso on a full stomach and then have about a 30 minute window to have a nap, before the jitter starts.

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Okay, I always read this. And my brother is a proponent of the nap technique you mention!

BUT: On an empty stomach, or even if I've had a little bit of food, it feels like caffeine works fairly instantly for me? I'm the stereotypical "can't function until I've had a little coffee in the morning" type of guy. Is this purely psychosomatic?

The speed that caffeine starts hitting your body depends very strongly on how full you are when you consume it and how much food/water you’ve already had throughout the day. The timing after a meal will be very different than an empty stomach, which is probably just minutes. People are more used to noticing the same effects with alcohol.

Well, that makes a lot of sense.

that's actually what i use to take naps wihtout alarm bell.

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