Okay, I've got a really geeky question about how sleep mode is initiated on the DS. Simply put, what turns on sleep mode? I know when I close my DS, it goes into sleep mode, but is there some sort of switch, magnetic "HallEffect" sensor, or something that says "Okay, the top's closed, you can go night-night now." I only ask this because I recently switched the case on my DS (bought a refurb one from Gamestop and they sent me a pink one...), and when I had it open I didn't notice any kind of switches or whatever that would turn sleep mode on. Okay, I'm rambling now, so any help on this would be appreciated.