I've had both hypnagogic hallucinations and night terrors a lot when I was younger, up until my early 30s. They almost disappeared now, which I can't really explain. For me the worst were the hallucinations, the most recurring one was seeing a dark figure abseiling from the ceiling or from the window, which after waking reveals to be a ceiling lamp or a curtain. It's terrifying stuff while you experience it and I even broken stuff in a desperate reaction of throwing objects to defend against the "intruder"