I had a really bad sleeping schedule last semester, where it got to the point where instead of sleeping before my awful 7 am calc iii exams I would just pull an all nighter, which was only an hour or two up later than usual for me at that point, and then head to my exam as if it was some evening exam.
The really dumb part is that I decided I felt like playing terraria for like 5 hours straight helping keith build this place, even long after he went to bed himself.
Needless to say I didn't do so hot on that exam...
Or really much of anything that last year, I just nosedived into video games really.