My guess would be the monster is the one who slipped the knife into your hand.
That reminds me of a real life event I had one night as a teen, I think. I experienced a night where every time I closed my eyes to sleep a hideous wolf would rush toward my face creating a wave of terror. This wouldn't stop and happened over and over to the point where I because so exhausted by lack of sleep and fear I determined to keep my eyes closed and die from its attack. The moment that happened it ceased to appear and I went to sleep. Your story also reminded me of a dream I haven't thought about in years and years. I was in a circular prison, a round room from which there was no escape but in the center of the room was a spinning massive diamond. As it turned I could feel beams of light reflected from the facets on its surface and as the light passed through me I became stronger and stronger. I felt a certainty that the room would eventually not be able to hold me regardless of the lack of doors.
Thank you for telling me that dream. I used to keep a foot long knife under my mattress in case the monsters came and on which, incidentally, my father had carved my initials, but I'd always find it later put away in one of my drawers. Perhaps the feeling of wanting to kill ones parents is more common than we ordinarily think.