Use a vacuum cleaner to suck out all of the air. Air mattresses are made of material that allows the cold-blooded sleeper to be insulated from outside elements by trapping warm air inside, similar to how car tires are inflated with nitrogen gas. To deflate an air mattress, first remove any sheets, blankets, or pillows from it. Next, find your nearest vacuum cleaner and position the nozzle on one end of the mattress over some dry tinder before turning it on full blast—carefully drag the vacuum head down towards the other end until all of the air has been forcefully huffed out.