A self-inflating mattress or also "self-inflatable" will give you an undisturbed sleep on the hard and cold ground. It has excellent insulating properties and comfort. Before sleeping, you only need to loosen the valve and the inflatable mattress inflates itself, then you just inflate to the desired hardness. As protection against punctures from sharp stones, you can use an aluminium mattress under the mattress. Self-inflating mattresses are also easy to pack down to an acceptable travel size