Dreaming of waking up in the morning, doing my usual morning routine, then realizing there's a tiny detail that's off, and then actually waking up? (Or maybe I'm still dreaming)
I have a lot of dreams where I wake up in a simulation of reality, but I usually notice right away and either get very upset, or try stupid stuff while waiting for myself to wake up for real (why can't I walk through my own dream walls?). The things that aren't right have been mirrors (silvery, barely reflective except some jagged colors), screens (weird text), and people's speech. (gibberish)
Sometimes I don't notice and get that loop where I wake up into another dream about waking up.
I get some more interesting ones sometimes, where I get killed, and then I go back to a point before I was killed and kill everyone. Those are fun.
I mentioned that one where I was stuck in a Hameru time loop of death and despair.