Who or what did mommy put under the bed?

I think I'm perhaps missing something here... I don't really get it. It definitely has a creepy air and mood, but isn't so clear and understandable that a reader can fully grasp it. I like the repetitions, but I still think that it would be better to make sure the poem is fully solid. Maybe it's just not for me... Nice flow and rhythm. It makes the poem easier to read.