Well I didn't type in the term "hypnagogic hallucinations"

The thing is it's not just when I'm falling asleep. It's pretty much whenever now, but is worse when it's dark out (could psychological nocturnal changes cause it? higher stress levels? the fact that I've just gone another 18 hours without sleep after only sleeping 2?)

I'm just trying to figure out the cause and how to stop it. It's not too pleasant when I'm more or less doing nothing and suddenly feel like someone's trying to jumpstart my brain engine and hear pluck, pluck, pluck.