boring "do as i say not as i do" allegedly-high-gpa-junior answer:
i feel like i'm at my best w/ staying motivated & avoiding feeling tired in the first place when i'm treating class like a job & budgeting time off accordingly
basically if ur in a full time college load? treat that shit like a full time job (and if ur in a part time load, commit to it like a part time job. [# credit hours * 2] = your hrs/week, give or take 2-5hrs, is my rule of thumb). i try 2 commit to a minimum of 6-8 hours a day 5 days a week, starting from when i get up. my schedule last semester had my first class @ 11am on zoom and while u bet ur ass i rolled out of bed hungover @ 10:55am every single day, after that i (tried) to be working on school stuff until 7pm. "working on school stuff" here is taken to mean watching lectures, going to/from class, actually being @ in-person classes, proper studying -- basically "all the things you would not be doing if you were not enrolled in uni" as opposed to just studystudystudy or w/e. [AND YOU KNOW WHAT, I'M EDITING THIS TO SAY: pick 8 hours that work best for you. if you find that you work best from 12pm-2pm, take a break to play ff14 until 8pm, and then pick up again studying until 2am? CHASE UR BLISS, FAM. just be consistent.] and if ur at a point where ur like "oh well theres nothing left to do"? THAT'S THE DEVIL TALKING. WORK AHEAD. there is ALWAYS something you can be doing, and if you work ahead far enough you can even have wiggle room for those days where you're just "fuck this, i'm binging buzzfeed unsolved all day and no one can stop me."
the catch is that once u hit that 8 hours for the day? clock the fuck out. even if you feel like you didn't do much -- clock. the. fuck. out. R E S T. there's no overtime pay here and nothing will wreck your motivation like not building in time for yourself to fuckin' relax, and if you're genuinely putting in 8 hours of work a day, there's a good chance you're going to keep up just fine. (if you try this and are not keeping up just fine, disregard me, try another strategy BLEASE, and Good Luck Fellow Soldier)
this usually goes out the window during midterm/finals week, and there's a H U G E "YMMV" issue with this strat, but i find that it works rly well for me when i can actually stick to it. im also a v. internally motivated person so take that as u will
tl;dr i always advocate that consistent scheduling over procrastination and panic at the last minute is way better for your mental health and avoiding that tired feeling in the first place LMAO.
also, i don't know what year of college you're in, but the workload of post-covid uni is easily 1.25-1.5x the workload of pre-covid uni and twice as stressful, so if you're ever feeling overwhelmed at any point please know that you are not the only one LMFAO. i kissed my 4.0 goodbye last semester and consider it a small price to pay to be out of that Hellscape Of A Semester