All I have to do is dream..

I'm getting the ball rolling here on a list involving movies about dreams/nightmares/sleep/insomnia. Characters having recurring/significant nightmares or dreams, sleep, etc.

"I Go To Sleep" -Anika (for your listening pleasure!)

So, feel free to suggest any dream/sleep movies I may be forgetting/don't know!!

There are 101 horror films in this list.