I agree with the importance of a good routine. I'd also look into getting some basic bloodwork done to make sure you're not exhausted due to a medical condition (rule out anemia, thyroid conditions, low cortisol, low vitamin D), but it sounds like it's just because you're staying up pretty much all the time and then literally passing out bc your body is exhausted.

Have you tried melatonin? It's over the counter and is milder than most prescription sleeping meds, but is really helpful in regulating your circadian rhythm (essentially your sleep/wake cycle). Something to think about.

Good luck.