It was akid movie but not animated cartoon. There was monsters that would come from there world out from under your bed. I remember one kid goes into that world with a monster and all I remember is violence/altercations occur because of the kid being in that place. It is a 90s movie I think. I know it is not a cartoon. Frig when I remember more I will say. I need to find it

Little Monsters (1989)

OMFG yes buddy thank you so dang much!!! YES!! Have you watched it? @min90