Apparently this is only available on the Roku 4. Why? No one knows.
Why do I need this? Because I often fall asleep with my TV on and it runs all night. My TV has auto-off, but since Roku is always-on my TV won't turn off. No reason why this shouldn't be a option on ALL Roku devices. I don't need to have my TV run all night because Roku does not turn off, even though there is no activity.
Please fix this on your next update.
Thank you
Roku Streaming Stick (3600 series)