Away gets set to offline

After a while of not having any activity on whatever device you are using, you get set to away until you come back. I think you should be able to have it go from away to offline after a certain time. As someone who very often forgets to turn off her computer, it shows me as "away" all night long, and I don't want people to think I'm potentially available when I'm in a deep sleep.

This setting should be able to be toggled on and off, and also have the person be able to set their own time interval for when it goes to offline!