I often cary an insulated thermorest fold up mat and put that under my air mat, it serves 2 purposes 1: it helps insulte you from the cold ground and 2: it protects the air mat from punctures.
Granted I wouldn't bother carrying it on a big walk in I'd just use my air mat, but even then a ground sheet under your tent makes a massive difference for very little weight or bulk penalty.
The only issue I see wit the space blanket/survival blanket is they are super thin (easily damaged) and super noisey, but in a life or death situation I'd probably still wrap myself in the space blanket rather than put it under my mat.
I always carry a survival blanket.
This is what I use under my mat when practicable
https://www.gearshop.co.nz/products/...kaAhmOEALw_wcB
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