Nightime Temp with Coughs/Colds for Child

[Nachtvlinder]

I know someone's child (8yo) is susceptible to colds and coughs have the heating on all night and an electric blanket for their room, but they're aren't able to afford to heat the regularly due to the cost of their energy bills. Isn't it better for them to not heat the room when the child goes to sleep and that the electric blanket needs to be switched off too for safety reasons? I hear that once you're asleep, you don't need the heating and when you're awake, your body temp is quite warm and toasty. The parents' say they do this to avoid the child from getting colds and coughs which they had had previously when they didn't heat the child's room.

Breathing in very cold air is damaging, even if you feel toasty in bed. The room (in my opinion) should be around 18-20 degrees (3 on a radiator control), even with an older boiler, the central heating could be timed to come on around midnight-2am then again around 6am-7am?

Not quite the question, but my DD currently has a cough and I find when her room is 20 she has coughing fits whereas at 17-18 she sleeps more soundly. I definitely don't let her room get colder than that though.

I was told no lower than 18 for a kids room.
If ours is, 2 of the dcs cough continually. Disturbing everyone's sleep, except their own somehow!

Thanks for all your replies everyone. I didn't know whether having the heating on all night for the child was excessive or not. They were prioritising her room to be heated but not theirs at night. Is the electric blanket a no-no, though?