Agree.
The only bad point of having a shared bed is that the kids get the odd idea that the trend will continue when they get home.. In our case he'll would freeze over before it became normal for then to sleep in our bed.
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Onesie or sleeping bag. Something thick underneath. Doona over top. Use the Portacot or a stretcher would get him off the cold ground.
Don't recommend sleeping with dogs - they snore worse than me.
The wife and I have sleeping bags with a nought degrees rating plus we can add silk liners for extra warmth.
Ron, I have a Catalytic heater, seems they were designed to keep soldiers warm in the trenches in WW1, they were considered safe because if they were accidently covered by a soldiers coat it would not ignite, just smoulder. The reason for this is that these heaters draw oxygen into the burner from the atmosphere, so you do need to have adequate air flow (ventilation) they can and will lower oxygen levels inside a tent.
My one runs on Shellite contained in a bottom tank filled with cotton waste, you sprinkle a teaspoon of Metho on the burner and light, the only time you see a flame, they are a bit smelly and give me a headache, Regards Frank.
You can buy 12 volt electric blankets, I use mine across the bottom of the bed to keep my feet warm, turn it on an hour or two before bed then turn it off, I find that a flannel sheet under and over with a wool blanket to keep the heat from rising through a Dooner is the best way to keep the warmth in.
Also cheap and simple a Hot Water bottle in a old wool blanket cut to fit the bottle is usually still warm in the morning. I have a hard floor camper and have camped in -5 degrees, also flannel pillow slips and don't take one of those Tempur (memory shape) pillows, they go as hard as concrete when cold, Regards Frank.