I've had trouble getting a good nights sleep on camping mattresses,
air beds too cold, self inflating not thick enough. After cruising a lot of bushwalking and hiking forums, they have the same basic needs as motorcycle campers, low weight, minimum bulk and max comfort I decided on an Exped downmat. these mats are expensive but in my opinion well worth the outlay.
They come in 2 thicknesses, Downmat 7 (70mm thick) and Downmat 9 (90mm thick) , they also come in a couple
of different sizes, I got a downmat 9WL ( wide and long ). The latest models also have a builtin pump which works very well, for more information and videos Google Exped downmat.