I suffer with bad sleep paterns asit is but I often experience really vivid dreams. As you are probably aware most of these dreams are only stored in our short term memory and I can never remember enough to write it down when i think about it.
Letely i have been havinf dreams where I might be trying to complete a task. FOr example hoovering some carpet and I just cannot complete the task no matter what and the most annoying thing is I often cannot wake until I complete it.
I also have the same kind of experience with things like reversing the car onto the drive or waiting for something to finish cooking in my dreams but it never finishes.