In Poland my radiator heat is on throughout the night!!!!!
In Italy, the radiator heat was on during the day (while I was working) and then would go off from 10 pm to 6 am (when the weather is coldest).
I guess it was a signal from some Don Benjamin Franklin-ese — “This is the time when all good Italians should be in bed”… I vividly remember having a conversation with a German student… we were both like “WTF wid dat!?”