I had a series of dreams like this once. Each dream would start off like any other dream, some probably-objectively-improbable starting scenario extrapolated in

I had a series of dreams like this once. Each dream would start off like any other dream, some probably-objectively-improbable starting scenario extrapolated into a sequence of events, but then at some point I'd 'figure out the trick' and become aware of some glaring flaw in my subjective reality at which point the whole dream would collapse and reset, to be replaced by some new scenario. This repeated a bunch of times during the night (I think something like six but how would you tell?) and when I woke up for real it took quite a while to be certain I was back in 'baseline' reality.