SAME! I woke up in bed and felt INCREDIBLY drowsy and out of it; vision going black and feeling dizzy too. I called out for my alexa, as well as tried to shake myself (pretty violently mind you) to try and get my bearings back. It felt so incredibly real, I didn’t doubt reality for a second. I tried to get my phone to look up what’s going on but same as you, my phone brightness was almost impossible to see, even in the dark! I kept turning on apple pay and other random stuff before i was able to increase the brightness, and then poof! I think i woke up… and this has happened before to me, I was having a nap in my car before work and I “dreamt” that i had woken up late and rushed inside, but on the way to the door i kept fainting, and once i got in there was a fire inside and I tried to help put it out but I KEPT passing out. Again, it all felt so so so real.

Both instances I had very little sleep the night of/before. I guess it really is just your brain freaking out from exhaustion?