Why does my tv keep shutting off at night???

please help!!! My TV for some reason turns itself off at night and only at night... My tv is on 24/7 just to have something going on for sound in the background.. I watch it during the day and it plays beautifully , but as soon as I go to bed and fall asleep , I'll wake up maybe an hour later and it'll be turned off ?? I honestly know this sounds weird, but I have no idea what's going on with it... I've tried looking up what it could be to no avail but no luck.. Any help would be greatly appreciated... Unless there's a ghost , then theirs got be a solution LOL... Thanks again for any advice

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Clarification Request
Always supply full model numbers.

This way members can check product manuals, prior discussions and see what firmware update the set is supposed to be at.

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My TV shuts down after four hours when nothing has been done like changing the channel. Can the change in the settings.

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Read Your Manual

Most TVs now have a setting that permits the user to define a time period after which, absent input from the user, the TV will automatically shut down. This feature can be deactivated when you find the appropriate setting, which varies for make and model.

You really need to provide more information when asking for help. Make and model of the set in question is essential in helping to solve your problem. For all I know you have a 1951 13" Muntz, where one of the tubes needs replacing.

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