I've been curious for a while on how they make this illusion. They've done this a lot on Sesame Street both with beds on high-rise stands and on floors. Do they use like a real mattress but make a big hole in it for the performers, or do they have bed sheets that cover up prop boxes...(you can see the side of the mattress under the pillow sometimes)? And how do they make the blanket move? Is someone's hands moving it underneath the cover or something? For examples on the show, there's all the E&B sketches, the ends of episodes #3239, #3508, #3793, etc. I wish I knew how they do this, because this is like a magic trick where you have to figure it out (unless it's been published somewhere and I haven't seen it).