Two sources have confirmed that (the reportedly very neat) Arkanoid DS won't sleep properly when you close it, if you've got the paddle controller in. The reason has yet to be determined, but Lawrence presumes that the paddle still consumes power even if the game is in sleep mode, because you can't 'sleep' the GBA cart, in which the paddle resides. So the game itself is still sleeping, but it's consuming power at a normal rate, and so will drain very quickly. Thought people should know!