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Don't know about a survival blanket but a plastic backed picnic rug under or over the airbed is good. we put picnic blanket on floor and a fleecy blanket, or old square sleeping bag opened out on top of airbed.

Also the poundshop has foam mats, not thick enough to sleep on but okay as insulation under beds.

The space blanket that you see used at marathon events and the like is of use if you are using it to keep body heat in as it reflects the body heat back, however as it is so thin it will not act as a sufficent barrier to the wicking effect of a cold floor if placed under the airbed and would also not be that comfortable to have around you in the sleeping bag (very noisey and sweaty).

The best solutions are to ensure you do not loose your body heat in the first place so (although sounding a little daft) a thinsulate hat will retain 30% of your body temperature failing that just put either an extra layer on yourself or as the general consensus appears to be an extra layer between you and the surface you are sleeping on.

Last summer I resorted to buying a micro fleece with a hood which was great for under a tenner.

I shall be sending the grandkids to sleep with a flea in their ears!  Besides that they will be sleeping on ex-army camp-beds, then cotton bath-sheets (folded in half ---lengthways), self-inflatable mats and finally 2 thinish (cheapo) snuggy bags (one inside of the other.

Regards,

Eric