I was part time last year: slept well. Went full time this year: sleeping like crap, awake earlier and earlier, now my routine is awake at 3am. Got covid and isolating for a week: realised this morning I haven't woken up at 3am once during isolation.
I'm not sure why working makes me not sleep well. But it causes me to be a sleep deprived, sad, lethargic bag of flesh. I'm not sure what I'm meant to do about it.