There’s a kids movie (British I believe) from the 70s or 80s I’m trying to track down. I saw this in the early 80s on TV. The main character is a boy who fell asleep in a pile of leaves and has a dream about rescuing/freeing children who are slaves underground. There are these crazy creatures that I can only describe as wet-noodle monsters, literally! Might anyone remember this movie? Thanks in advance!