Last night I dreamed that I was dreaming, and inside the sub-dream I knew that I was dreaming because I could change reality: at one point, I was wearing only underwear, then a bit later I was wearing trousers, and when I noticed that, I tried to "take off" the trousers just by imagining them off, and I was wearing underwear again. Then I "put them on" again and I was wearing trousers again, and I felt them, and they felt like denim, so I was indeed wearing trousers. I thought that was pretty cool. When I woke up, I told Stella about it.
Then, this morning, I woke up for real :) So I dreamed inside a dream, which has happened before, but I think this is the first time I realised I was dreaming.