Whenever it reaches around 2AM on Sims 3, the game always freezes. But the animations (Zzz, trees, bushes, etc) are still moving. Clicking everywhere won't help..
It happened in my last save, too and I thought that making a new save would help, but it didn't. :| Here's the times that the game froze:
Last save: 2:00 AM
This save: 2:38 AM
Both of the saves are in Sunset Valley.