AITAH for refusing to wake my girlfriend up for work, which led to her getting fired... 

Time to move all your belonging out of the apartment and leave her. Leave her.

Run!!

Send this woman back to her parents and let them finish raising her then get someone younger and hotter who is an adult.

the first person needs to go to jail because clearly his girlfriend is a child.

That sounds like a Jess problem.

going through something similar right now, gf stays on a stupid browser game until 1-2 in the morning, tries to wake up at 6, fails, wakes up at 8, goes to work later, comes home at 21 and repeats and she says 'I just have to manage it better'; bitch, you ain't managing anything by doing the same routine and expecting different results; had to vent a bit