How do I set up a sleep timer?
Press the Menu button on the remote, use the Arrow buttons to highlight Timers and press OK. Use the Left/Right Arrow buttons to highlight the period of time after which you want the TV to go to sleep: 30, 60, 90, 120, or 180 minutes. If you don't want the sleep timer to activate, change the setting to Off.
From the official Vizio Power Cycle Tv manual, page 24
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