We’ve used a cheapo flock double airbed for years with no problems and my wife is a cold sleeper.
Much more comfy than any of the “self inflators”.
I bought one of those, having no experience of doing the camping thing, except for one Reading festival; the weekend was sheer misery, the temperature dropped, and having only a lightweight sleeping bag I was chilled to the bone!
I slept in all the clothes I had with me, wrapped in two blankets I carried in the car for putting around the bike.
I learned the hard way, after seeing a thread on here, that they’re the worst possible things, being full of air which cools to the ambient temperature.
And my abiding memory of the two festivals I’ve done since is the wheezing noise all through the night as numerous people keep having to re-inflate the bloody things, and the huge number left outside of tents, deflated and scrunched up and left behind afterwards.
I bought myself a Gelert 10cm SIM, which only requires three or four puffs after being unrolled to provide a really excellent night’s sleep, helped by a £20 Lidl bag which is snigger than a really snug thing!
The SIM was originally £70, reduced to £17, and my tent was £75, so the camping I’ve done over the last five years has been both really comfy, and dead cheap!