So just a few weeks ago I was out camping with my wife and another couple. Went to bed pretty drunk, woke up at 3am hungover. After drinking a couple swigs of water laid back down to go back to sleep. With my eyes closed, I start to see a yellow eye with a slit pupil appear in my vision. As I notice it and am taken by how crystal clear it is, an entire face begins to manifest. It takes about 5 seconds before it fully forms and I see what looks essentially like a T-Rex staring directly at me. Over the next 5 seconds, this T-Rex aggressively "bites" me every .5 seconds, causing a very unpleasant and painful feeling that reverberates throughout my central nervous system with each bite. After the 5 seconds I was able to open my eyes and sit up in the tent ending the experience, still feeling the after effects of the sensations traveling about my nervous system.

I have had other experiences including what I would call a "dreamhack", which was essentially a fully lucid dream I had no control over in which I was shown visions of black ships with red lighting descending from the sky while being bombarded with the emotion of dread over and over.

Other experiences have been more positive or just neutral and strange. Never seen a being in the physical though.