Dream state to reality movies?

Hi guys I am creating a 60 second short film for a university class and am in need of some film scenes that fade from reality to a dream state for ideas. Can anyone share some good films or tv series that have this kind of transition?

Thanks
Josh

^the cell is amazing.

what about donnie darko?
also theres an episode of buffy where this happens called normal again,but thats a tv series so i dont know if that counts?

Thank you all. Helps alot!!

My friend Don really get upset when it's a horror movie where the guy wakes up from the nightmare and then finds out he is till in the nightmare. Like in the Oliver Stone movie "Seizure."
But maybe he just shouldn't see horror movies. I recommended to him the book Dracula by Bram Stoker, and he couldn't finish it because it was just too scare!