It's bad to consume too much caffeine.
Dave is finishing up some work at the office late when his secretary asks him if he'd like another coffee.
Dave wants to answer the question.
Dave declines another cup of coffee as it's getting late, and he's been drinking it all day.
Dave tells the secretary to go ahead and to brew another pot for him since he's not finished working.
Dave falls asleep peacefully at home after a long hard day at work.
Dave can't fall asleep later that night as the last cup was practically at night time and now Dave is restless.