I have experienced sleep paralysis for most of my life, I can still vividly remember the first night it happened as a small child. So I hallucinate things when I'm coming to/fro sleep.

My dreams were pretty vivid before but it was only after that when I began to train myself. But I would commonly see people, ghosts, aliens, monsters, etc. creep out of the shadows at night and touch me or just remain beside me while I was drifting off. A couple of months ago I (hopefully) hallucinated that I was visited by a succubus and it was quite tangible and vivid.