Why my tv shuts off after been on several hours?

Hi, I have a little problem with my TV, it shuts off after been on several hours. I have a SONY KDL 40EX720. Thanks! or:Hi, I have a little problem wi

Hi, I have a little problem with my TV, it shuts off after been on several hours. I have a SONY KDL 40EX720. Thanks!

or:Hi, I have a little problem with my TV, it shuts off after been on several hours. I have a SONY KDL 40EX720. Thanks!

or:Some TVs have a sleep function on them that will turn a TV off after it has been on for more than so many hours, or a child lock feature to keep the TV off between preset hours.

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