yvonne,
u very cham le. haiz.. my room also full of things. but luckily for me, my ceiling is high. hmm, i agree with Nana.. too many bolsters and pillow is also no good as that can trap dustmite easily.
u mind drilling holes in the wall? or your PIL will mind? if don't mind, and not scared ugly, then I suggest u can fix a wall-fan. It might look a little ugly.. but it helps to save space.. and also because it's fixed high up on the wall, it also helps in the kids not going to touch and put their fingers in the fall. Then u see where Bel sleeps, u fix on the wall area near her and aim the fan at her. can consider this option.