Getting up the next morning if you use too much is difficult, but in my experience it's almost the opposite of a hangover; instead of the world seeming horrible

Getting up the next morning if you use too much is difficult, but in my experience it's almost the opposite of a hangover; instead of the world seeming horrible and impossible to face, my bed is simply the most wonderful place I can imagine being. Keeping a caffeine pill next to the bed can be an effective countermeasure.