Instructions
Go to stage 9 of the game, which is called "Bubble Bed Bonanza." This is the first level in which you receive the bubble bed.
Play through the stage until you reach the room with the bubble bed. In "Bubble Bed Bonanza," the bed is located in the quarantined area and can be obtained by defeating the humans in the room.
Go next to the bubble bed, and press the "A" button to place it on top of your cart for use.
Head into the elevator next to you and it will lift you to the rooftop, where you can use the bed to float to other buildings.
Go to open ledges and flick the Wii remote with your wrist to launch the bed into the air. You can float for a short time in the direction of other rooftops before the bed begins to deflate. Flick your wrist again right before the bed deflates all the way to give you another boost of air. You can use three boosts of air, including the boost used to launch the bed, before needing to land and regain your boosts.