if you can pound 2 cups of coffee right before bed and aren't staying up.. something's wrong.. RIGHT?!?!
Someone smart chime in here.. all we got are anedoctal ish
If it's literally right before bed - it shouldn't have an impact on the ability to fall asleep up to 30 minutes later. It would definitely impact sleep quality... typically.
Thing is - some people literally have such a drastically reduced caffeine sensitivity that it really doesn't do anything for them. I seriously want to study the hell out of these people to figure out why, because it doesn't make sense based on the mechanisms of the underlying chemical and similar chemicals.
Now, if it's a matter of tolerance, and someone can drink that much without impact... something is sort of wrong. I'd say it's "right", in that it could be expected for some individuals - but... it's definitely wrong that they have that high of tolerance, in that it CANNOT be free of harmful effects taking in that much.
I expect my usual 600-800mg-ish caffeine intake a day is doing some long-term no-good for me, and I know I couldn't achieve a good night of sleep, or even the ability to fall asleep, taking a fair bit of caffeine like that an hour or two before bed.
Well I know I could, but it would require other chemicals interacting. Copious amounts of alcohol can help, even better would be diphenhydramine (benedryl, unisom) to really help knock you out.
Not necessarily ingredients for quality sleep, but allowing sleep to be induced is an easier task to manage than guaranteeing a good night of sleep.
