I voted 'maybe" but there is this recent family occurence:
My cousins' wife works as a volunteer in the Fort Erie (the municipality, not the fort) museum in Ridgeway. Last year a couple asked her for some information on their home, which was an older building. As it happened, the house they were asking about was the home her husband had grown up in, but the main point is that their 11-year old son told them he had seen a boy about his own age appear in his bedroom. The boy was not threatening and gave the impression that he wanted to be friends with the son.
My niece, who told me this, was mildy amused and clearly believed that it was a case of an overly active imagination, and maybe it is. She was taken aback when I paled and said "Oh my God, Larry." Larry was my cousin who died of an infection in 1943 aged 11 in that very room in that house. I have no recollection of him, as I was a pre-schooler, but my mother spoke of him often.
I can't explain it.