I haven't slept at night since the age of 14. It's a miracle I graduated from high school. At least in college you can take classes later in the day. :p
I've had sleeping problems further back than I have memories apparently. Folks used to claim even when I was 2 I'd not really sleep. Mind always has too much going on.
Yeah... not sleeping can make school pretty rough. Never really had the focus to study. Toward the end before I began bothering to drink and take substances in college I'd stay up for five days and "coma day" the sixth, focusing on waking up the seventh day.
It's nice being able to sleep a little more regularly now.