to be honest, I’m an insomniac IRL as well, a 20-hour day is pretty tame.
However if you just take some Nyquil or sleeping pills you should be fine. Then again, I’ve been proscribed strong sleeping medication myself and it only worked for a few days before I seemed to build up a tolerance to it. Awake till 3am, fall asleep from exhaustion and end up late for class.
An afternoon class. Ah, good old uni days.