Buy a decent air bed and it won’t squeak or deflate 😉
And don’t forget to put a thin foam mat on top for insulation.
Self-inflating mats are fine if you don’t need to be comfortable – they are just way too thin for me, although having said that my Mulitmat ice mat is 10cam thick, so not too bad, but heavy.
For cycle touring I have just upgraded from a Vaude Norrsken to an Exped Synmat in the biggest size – the Norrsken was really to narrow.
Lots of options – really hard to find out what will suit you without spending money!