My previous TV (Sony Bravia) has an automatic sleep after a time period without no remote control or TV button interactions.
I miss this feature so much. I could set up the sleep time (40 minutes, 1h, 2h ...) on TV setup. Close to timeout, an overlaid message warns about the inactivity time and it'll be soon shutdown.
I know my TV 55UM76 allows to use Sleep timer, but it isn't the same thing.