Yes, that was very poorly worded but you got it right. By waiting 90 minutes or so, adenosine will reach a reasonable baseline for daytime wakefulness. As I u

Yes, that was very poorly worded but you got it right. By waiting 90 minutes or so, adenosine will reach a reasonable baseline for daytime wakefulness. As I understand it, adenosine will inevitably build up during the day to some degree while caffeine is occupying receptors, but not enough to really matter. However if it’s combined with remnants from the night before, or you had a ton of it when you woke up and drank coffee, you wind up getting hit with enough to actually trigger your brain to try to go to sleep. That’s why sometimes you’ll suddenly be overwhelmed with sleepiness and might even start nodding off at your desk if you had a bad sleep. In my experience it feeds into severely inattentive mental states, even if I slept really well. It kind of ruins my work day by around 2pm.