One clue though. It did it at night (ingame) and it might have been around th 1am point. This would have been the first night time period in the game since activating AM. Might have something to do with the 1am lag issue. Anyone else notice crashing around that time ingame?
Are you serious?
Try searching 1am crash. There are dozens, maybe even a hundred+ of posts now, about that very thing. It is something with the EAxian story mod and a possible conflict with AM tweaks, or other conflict. Switch to AM story mode, and the problem goes away.
I'm all for blaming EA for bugs since it's usually their fault, but not this time. I've been playing with the WA expansion since it came out. There were and have been a ton of bugs so far, but no cases of CTD on my PC. And it's not a lack of resources. I have a ton of RAM, a great processor, a top of the line video card, and a liquid coolant system.
I installed AM and the game CTD'd the first time my sims went to bed after I loaded that game.