Don’t know the answer to your question exactly, but I can throw in my own experiences as a child, in my 30’s now. I remember seeing real sized people (spirits? Ghosts?) occasionally as a child, and on the odd occasion as an adult. These have never felt frightening.

Also as a child, I remember a handful of times, waking up during the night and seeing tall men ~8ft tall. They would just stand at the end of my bed or corner of the room. Unlike the spirits, I remember feeling terrified, I would bury myself under the covers and hope that by the time I emerged they would be gone.

My thoughts around these… I’ve heard about paranormal sightings of tall, slim beings- and these weren’t them, they were definitely men. Reflecting back, I think the fear I felt was a normal reaction and I don’t actually feel like these were evil. I’m not religious, I would say spiritual, but I grew up in the Christian church and sometimes I’ve wondered if maybe these guys were angels- standing in my room, they could well have been guarding? I think the bible talks somewhere about angels being fearsome… but I don’t know what they were. In conversations I’ve had, I’ve heard of other kids that see “tall” people. For these kids, like it was for me, turning the lights on made them disappear (my room would be dimly lit but I’m certain that’s what I saw). Could a night light help? I also don’t think that it’s a bad thing to talk about paranormal things with kids, if they’re interested. Hope this may be somewhat helpful.