Is it true that television channels used to stop broadcasting at night?

Is it true that television channels used to stop broadcasting at night?
Although it may seem hard to imagine today, there was a time when television wasn't available 24 hours a day. For much of the 20th century, most television channels in many countries broadcast limited programming that began in the morning and ended around midnight or even earlier. At the end of the day, it was common for stations to broadcast the national anthem accompanied by the country's flag or patriotic images. After this symbolic act, the signal was switched off completely, and the screen went black, displayed a test pattern, or emitted static until programming resumed at dawn.

This practice stemmed from several reasons. First, the technology of the time was much more limited, and maintaining continuous transmission entailed high operating and maintenance costs. Furthermore, viewership during the early morning hours was very small, making it unprofitable to broadcast programs during those times. It was also common for stations to use this time to perform technical maintenance on transmission equipment to ensure optimal performance the following day.

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