Exam week - as for a lot of others. Our mathematics department was notorious in the college for having extremely sadistic professors. To give you an idea - 200 out of the 650 freshmen failed mathematics in my first year but wait - the passing score was 13/100. I studied at one of the top technical institutes in my country before you all accuse us of being dumb af :P
Anyway, exam week - I hadn't slept for close to the entire week, except for a few 1-2h naps. Unlike a lot of people, I didn't see anything THAT extraordinary, but I'd hear people mumbling in my ears when I wrote the exam. My movements became somewhat...jerky? Like, I'd try to do an action but my hand moved quicker than it should - dropping the calculator off the table like 4 times during the 2h exam. The mumbling was something I didn't bother at the time because I did have a lot of people in the hall. The only issue? They were spaced about 4 feet apart, and we had 6 invigilators in the room.
Oh I also slept through the last paper. Would not recommend. When I tell people I finished an entire jar of coffee powder during the one week they look at me like I'm a whacko xD