This is a little game Sophia likes to play. When I put her on the bed, she scoots herself over to the bottom side and slides her little torso down until she's tightly wedged between the matress and footboards. She thinks it's pretty funny. We ask "Are you stuck?" and she says "Ya".
We're trying to expand her vocuabulary by teaching her to say "Help me!" as her request for being removed. Then we pull her up and she is slowly sucked out of her predicament. Then I'll go and try to finish brushing my teeth and she'll do it again.