Our airbeds had gone mouldy so we bought new self inflating matresses, tried them in the shop and waxed lyrical about how fab they were. 3.30am dh left the tent and went to bed indoors, but is forgiven as he's post op and has stitches that were painfull. I have a v sore back . The matress was a 5mm outwell one, we are considering buying another and lying it on top, but not sure if this is just chucking money away. Any ideas? I really liked not having the waterbed feel of an airbed.