Forum:Random Money?

Okay so this has happened a few times and it just started up again, my game gives me random money? It will be late at night when my sims are sleeping and then just randomly it will add +1,200 - 20,000 dollars to my sim's account o.O Now, I've checked everyting off the list: No Mods, They're not a Celebrity, Not at work, Haven't done anything recently, haven't sold anything, and don't own any community lots. What is going on, any ideas?