I once drank 9.5 Monster double stacks in a period of 4 hours.... Needless to say i was up until 5 in the morning, then i had to get up at 7 to go to work( manual labor too, I work at a ranch). BAsically i felt really shitty when i woke up then BAM! i was awake for the rest of the day. I felt kinda dumb, which i was