You can add the Haunted lot trait. That will add a chance for a ghost to show up every night. I waited quite a long time, but didn't see any. Or you can do what I did, find Felix Psyded (if you have University), one of the sims who, I dunno, is supposed to be a Uni professor or something. Become fast friends with him, so you can ask him to join your household. Easier to max out friendship that way. You can always kick him out after. He doesn't mind :)
Its been a while since I did this scenario, and don't quite remember if the "stay awake 5 days" is bugged or not. I might, or not, have cheated that goal, since my sim was very much awake for many more days than 5.
