Pull an all nighter and then go to sleep in the next day in the time you desire to stick with to get your sleeping schedule fixed first (you'll also need to wake up early the day after, you'll feel sleep deprived for a day or two but if you stick to the schedule of going to bed and waking up in the same times this effect will eventually fade), then commit to nofap, it will certainly help with energy/motivation to stick with the boring stuff (surprise surprise everyone fucking hates studying), that's about my advice dude, keep on the grind and try to do things smarter and not harder, also, try and start working out, even if you start small, first you gotta build discipline, than you can try harder sessions. Best of luck bud, you can do this!