Hi,
I know your TV has a sleep timer on it, but why couldn't VMC have one? I think it makes sense. I know that life extender (which is pretty darn awesome) has the ability to shutdown the machine after a scan at a set time but that isn't remote friendly and maybe you'll still be awake @ 0200 and the machine turns off (goes to sleep/hibernate, etc.) not cool.
Another reason:
So say if you have a sleepy time music or tv playlist and you don't want it playing when you wake up in the morning, you could go to the main menu set it to put the machine to sleep in 1 1/2hrs.

Do I make valid points? It could be a Tile and be a blue box with a white border with big white numbers and increment in 15min intervals. Could anyone make this? I really suck at Vis C# and MCML....I tried.