Volume fade when Sleep timer set

[googeo]

It would be nice to have the option to select in a tickbox below the minutes slider, in sleep timer menu, to make the volume fade as the time goes to expire... Since some of us use it during sleep and set the timer so that it closes and not wake up, it would be more natural and more "sleeping friendly" the volume decreases in a rate (exponential, linear or whatever) (example 1). If you are still awake and feel the volume too low then by pressing the up-volume button you can bring it back to normal and may start the decrease again (example 2). What do you thing?