I have a Google tv box connected to my bedroom tv. I would like to listen to music while sleeping but YouTube music always show me the album image. This creates too much light. If I close my tv, I lose my sound... What can I do to have some sort of screensaver started while listening to YouTube music?
That's by design. YouTube Premium allows you to have sound while the screen is off; they want you to have to pay for that feature.
Possible workaround: cast YouTube music from your phone, leave phone charging face down. Turn tv screen off.