Weird mind stuff while trying to go to sleep?

When I'm laying down in the dark, while I'm trying to go to sleep, I get this weird load roaring airplane take off noise in my head and a strange image of some stick figure butterfly flapping it's wings rapidly- I also have a weird feeling in my mouth like there's something in it that keeps getting larger and larger... It all starts out mildly (quiet roar, steady flap, small object) but it all increases to the point where I cant get it to go away unless I sit up and turn the lights on. Do you have any idea what it could mean/be?? Please help, I cant get to sleep!