Have you thought about hiring one of those Lullabub things? You know, they go on the bottom of the cot feet and simulate being in a car/being in Mum's womb. When your baby wakes, they have a remote control you can use to set it off, so you don't even have to go in the room. You can hire them for just over $1 a day, or they retail for about $250. I know they're going for $199 at the moment, as they featured on ACA last night.

Maybe not what you're looking for at all... but thought I'd mention it.

Celsie. xoxox