No underfloor heating in the bedroom?

Baby monitor? ;) and which child can get out of bed by themselves but still cannot open doors? and yes, I have three myself ;) in general, it is usually always advantageous to heat all rooms in the house more or less evenly. The bedroom is then heated by the adjacent rooms.

Haha, that question can almost only come from someone who has no children ^^ Because the child might wake up and scream and then you hear it earlier. Or because the child wakes up and wants to come into the bedroom, but can't open the door by itself yet. There are reasons for that ;)

You guessed wrong there. 0 and 3 years old. But just like , I wanted to get to the option of a baby monitor. I can't sleep well with the bedroom door open and I don't have to put up with that even with a child ;)

And the 3-year-old anyway toddles over to us and opens the doors when he wants to change clothes at night…

To each his own. My bedroom door is always open as well.

Regarding the original question:
In the past... everything was different.
People kept the bedrooms cool because they did not spend time there. Shortly before going to bed, they heated the room to then cool it down overnight with an open window.
Back then, in the past, we wasted more energy.

Houses without basements had underfloor heating or a return flow for cold feet on the ground floor; on the upper floor, it was not needed.

Houses nowadays are so well sealed that a room does not cool down quickly. With underfloor heating, you bring comfortable warmth into the house and have no ugly radiators on the walls.

does not have ugly radiators on the walls.

There are nice radiators nowadays as well; however, they need space and usually restrict the use of the room quite a bit. For me, that is one of the biggest arguments against radiators.

With underfloor heating, you simply have much more space.

The infrared things have this disadvantage too. Only a towel radiator is something I can accept.