Children's movie about a flying bed?
I hope I'm not getting two movies mixed up, but I can remember an animated children's movie that there is a boy that flies away on his bed to a different world, and there is this one part where he is a dark place and there is this black mucky stuff that starts gurgling up and then he goes up a stairway to get away from the muck. That's all I can really remember about the movie- but it has been bugging me for a while now- if anyone has any ideas on what it could be- that would be awesome! Thank you! :D
