How do I prevent my iPod nano's screen from going to sleep? I have broken my desk clock and am trying to use my square nano to show me time instead.

The problem is that when I set the screen to show time and leave it for some time the screen dims and eventually shuts off after which I have to get the screen back again by going to the menu.

Is there a way to make sure that the screen does not turn off? Dimming should be okay to save power, but it should at least show the time when I touch the screen.
Go to the stop watch and press start, now slide back to the watch face and it should stay on.