This morning I was dreaming of gusting winds and pelting rain. I woke up and actually heard those sounds outside my window  – it turns out there was a pretty bad storm going on out there. My dreaming mind heard those sounds, and incorporated them into my dream, which is a very common phemomenon.
Have you ever woken up to some kind of noise or sound, or even a song on the radio, only to realize that you had also been dreaming about it?