I kept doing that for 4 years with my favorite Doctor Who household. I'm now just playing a Doctor Who Legacy that's made him now his own Great-Great-Great-Great-Great-Grandfather/Grandson. I'm doing this until I reach the 12th Doctor Who. :p
Also, I've noticed that I kept restarting my Darknight Couple (based on Batman & Batgirl) way too many times. So now I'm just going to leave them married & parents to their little girl Robin; I'm even thinking of getting them to have another baby but this time a boy. However, I have to think of another name because having two Robins in one family is silly. :D
Another time I restart my game is because one of my favorite sims has died from hilarious so to get them back I make sure I don't save so I can just go back to the last save & prevent the death from happening.
FYI: I kind of figured it out how to prevent sims from getting to giddy so their mood doesn't turn into hilarious. I get them some inspired plaques & inspired potions. It seems to help them. ;)