I have four kids, 16, 14, 10 and 5. The five year old had these -- awful, every night from age 11 months at the same time. He'd wake up the entire house screaming hysterically. If I used cloth diapers (I didn't) I would swear he had a pin sticking him. This went on for months! We moved into this house when he was 5 months old, and little Roy's crib was in our bedroom with us.
Please don't think I'm crazy. The original owner died in the house (I didn't find out for several months after we had moved in) and her husband had a heart attack just weeks after they built it, she managed to hang on and raise her two daughters there. She died of a brain tumor. Clearly, very attached to the house.
The older kids began seeing things (no, I didn't tell them what I learned from the neighbors) very soon after we moved in. Footsteps, loud - we all heard them. Other things happened, not worth detailing here. I finally put two and two together. Went into the empty room, mid-day, and said (out loud) "Listen, I know you probably love looking at the baby but you are SCARING him! Please stop."
I swear, on my childrens' lives, from that day onward the screaming stopped. Never happened again.
True story.
Laura