My husband and I live in his deceased apartment. She died 6 years ago. Her old bedroom is the general 'nursery', though baby who is 11 weeks old sleeps in our room. I put the baby in the stroller in the nursery as we are about to go out to do laundry. I went to gather his sheets from our bedroom and when I came back there was my SILs childhood music box playing, (from where, I can't find). It's like the creepiest horror movie ever. I'm on my own in the apartment. I don't believe in ghosts, am not religious and am not spiritual. Funnily enough, I'm exactly like SIL when she was alive. AIBU to be utterly freaked out by this?