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Doesn't coffee impact sleep quality as well? At 6 cups a day, I'd expect some caffeine left in the body when sleeping.


Twelve hours to metabolize. The six cup people are totally jacked.


Half-life of six hours, so after twelve hours, one quarter of the caffiene will still be in the blood.


Tolerance kicks in. I can drink a double espresso after a dinner and still sleep like an angel.


Perhaps, but do you really know if and how much REM sleep you are getting? I've seen some things that link dementia more specifically to quality of sleep and REM time.




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