Can you put it on the scales, please? beipackzettel doxepin-neuraxpharm Around 10 p.m., I gathered my sleep-warding weaponry (Red Bull, coffee, loud music and a fan on full blast blowing right in my face) and proceeded to study. I did fine until about 12:30, when my eyelids began to droop slightly. But, after a few Red Bulls â four, to be exact â I was fine. And by that I mean I felt energized and alert enough to run a quick 5K, fight a bear or three, and still have time to get to class and ace my final.