Top best answers to the question «Is it ok to leave a tv on all night»
So in the long run, the a TV left on all the time will get dimmer, sooner, than if you only watched it 4 to 6 hours a day. Reducing the backlight control (many LCDs) or turning down the contrast (plasma) may extend the TV's life some, but only to a degree.
It's also why most researchers and sleep experts recommend not sleeping with the TV on. While you might find that your TV helps you fall asleep, experts warn that the quality of sleep you'll get will suffer. Plus, sleeping with your TV on has been linked to some negative health effects.