How do you deal with sleep?

No easy answer for this. Sleeping late and all will inevitably mess up the quality of sleep you get so the best you can do is make sure you stay hydrated and maximize sleep hours instead of going out or watching TV (just in case you do). With the hours you'll pull there's no real solution unfortunately

Stretching, slow breathing exercises, CBD, lowering the temperature and blacking out your room can go a long way. Any type of wind down ritual will require some time to take but eventually it signals to your body that it’s time to snooze. I also recommend a sunrise lamp to wake you up cause alarm clocks send you right back into hell. Goes without saying avoid too much coffee and addy late in the day. It starts to not help after a while anyway.

I have the same issue. I was debating buying blue light glasses to see if that worked. Does anyone have an anecdotal evidence of that working?

If you can mix in any type of exercise during the day it helps immensely with getting (body) tired later in the day - and oftentimes can give you a nice mental boost to push through the remainder of the day (or at least just provides a short break from staring at a screen) 

quit IB

Idk if this helps, but keep in mind that whenever ur at bed, some rest, even if you're not sleeping, is more beneficial than no rest- that mentality helped me sometimes

Masturbate

develop a small health routine before bed (stretch and breath slowly). read instead of looking at a screen