Having an air mattress with an electric or battery-operated inflater in your car can be handy for so many reasons. If you find yourself at the emergency room or spending an unexpected night at the hospital with someone, you can blow it up and slide it into the corner of the room to sit or sleep on. If you're at a party and have had too much to drink, it sure beats napping on the floor! If you're camping or hiking and want to look at the stars comfortably, voila! Inflatable bed.