So, I had this experience BEFORE I went to sleep last night.
I was lying in bed, thinking how awake I was, even though it was after 01:00, I closed my eyes and 'saw' a blur at the bottom of my vision (I thought it was some sort of afterglow that you get when you've been looking at something bright), but the blur morphed into the shape of troll
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imagine one of those, but it's like a midnight blue 2d cell shaded version. It started dancing around, like it was on chest, but like it was a hologram. It then appeared to notice that I could see it!
A larger vista appeared and multiple shapes (looking vaguely like people, but not human) were peering through a window or portal (it had had foggy edges) at me, they were all various shades of dark blue, purple and black. There were a couple of cyan shapes moving around, they had black faces (or at least black areas where there faces would be, I couldn't see any features) and bright red lights for eyes.
It looked like they were all talking about me, but I couldn't hear anything, only see them, it looked like they were incredulous that I could see them.
It was like they were filling the space above my bed, but it clearly wasn't there there was no substance to it, like some badly done 2d special effects from a 70s film. At one point I did the cliched thing of reaching out to try and touch them, but the vision, hallucination, whatever it was, was not tangible and appeared to be rendered in front of my arm.
After about 5 minutes it faded away and I was just in my bed, with my wife sleeping beside me.
I can tell you I was more than a little disturbed, and it took me sometime to get to sleep, this might not technically be a dream, because I am pretty sure I was awake for it, but I was in bed, so I imagine some part of my brain was dreaming, before I actually fell asleep.