My sleep issues are their own thing, irrespective of the caffeine, but it always makes me go o.O when people report caffeine actually, like, keeps them awake. Me, it just keeps functional. I am a true and unlikely-to-change junkie. That is to say, if I have none, aside from the headache that sets in within a very few hours--no, seriously, single-digit hours--I pretty much slow to nonfunction. If I did as folks all say and actually didn't drink caffeine after noon? I'd have a caffeine-deficit headache by bedtime much less by the next morning.

And I have been known to drink a quad latte at 7:30 am, go to the gym, do an hour of spin class, shower, come home around 10, and fall immediately asleep for a two-hour nap.

Heh.