Too hot at bedtime with heat off overnight?

[HotThenColdThenHot]

This sounds dumb, but... if you have your heat off overnight, how do you handle the temperature difference between when you go to bed and in the middle of the night, especially for children?

My problem is that when DS goes to bed, even if I turn down the heat ahead of time in his room and close the door, since the rooms under and around his still have the heat on, if he uses the thick duvet, he gets too hot and can't sleep.

But, if he uses a thinner blanket, then he wakes up cold in the night.

How does everyone else fix this?

I can understand putting on more blankets to stay warm in the night, but it's handling the temperature difference between bedtime and middle-of-the-night I can't get my head around. (Both DH and I grew up in different climates, so we genuinely don't know the answer.)

Go in and turn his radiator on when you go to bed maybe?
Keep his door open, but his radiator on, so it doesn’t get too hot at bedtime but stays a nice temperature all night?

Just have the thermostat on his radiator down so it never gets as hot?

Two thin or medium duvets. Start off with one, with the other folded back on your feet. If you get cold in the night pull up the second one.

I go in when I go to bed and pull up a fleecy blanket over my DD. Her room is chilly by then but she doesn’t seem to be bothered and normally there’s at least one bare foot sticking out.

She probably throws the extra blanket off, but it makes me feel better anyway

One of my sons gets so hot in bed, but we have it worked out now. I have the radiator off in his room, with a thick duvet on his bed, and the window open when he goes to bed. When we go up, we shut the window. He also sleeps in his pants.

Rather than keeping the heating off completely overnight, could you drop it to say 16 degrees C from his bedtime so there isn't a big drop in temperature. It won't be needed most nights but will come on when it's very cold.

Our heating goes off about an hour before bed, so it's already starting to cool by bedtime and thick duvet and warm jammies are fine. Adults staying up later use sofa blankets and dressing gowns/slippers.

Thanks all, now I have some ideas to try, probably starting with the two thinner duvets, so one can get pulled up when it gets cold later in the night. (Right now, we don't have the right blankets to make a combination like that, but if I buy a thinner duvet, we will.)

Drop it to 16... I have never put thermostat above 16....
Two thinner duvets sounds like a plan.