I recalled one of my dreams in an unusual way (at least it's unusual for me). After waking up in the morning and recalling one short dream, I went back to sleep. During that 20-30 minutes, I think I had a big dream, but since it was only a third of a dream cycle, I believe that something triggered the memory while I was asleep. Therefore, when I woke up, I was like, "Wow! I remembered another dream!"