Hypnopompic and Hynagogic Hallucinations

A lot of us have hallucinations in our sleep. These fall loosely into two categories, don't they, like hypnagogic and hypnopompic? So, could you explain what those are and what the differences are first, please? Yeah, so hypnagogueic comes from the Greek as you're coming out, as you're going into sleep. The rarer form of this sort of twinned hallucination is calledhypnopompIC. That's where the name comes from. And so you wake up while your brain is still sort of dreaming, and it projects all sorts of horrible things into your bedroom.