can no longer set t v to go off after 1 hour under the power saver / preferences/ device setting

I no longer have an option for T.V. to go off after 1 hour with the power saver option.

All I see now is this:

"Power saver - on'

" Conserve energy by setting your T.V. box to power down when you're not watching."

Have had it set to power off automatically after 1 hour of non activity.

Woke up in the middle of the night and T.V. was still on after 4 hours.