I know we've had capabilities to edit the sleep screen for some time. But when the news first dropped on this, I remember feeling that it sounded to convoluted and complicated. Looking recently, I found a very simple and straightforward tutorial on how to do so here: http://dungeonfire.tk/ I followed it, and within 15 minutes or so I had my custom sleep screen up and running. It is a bummer that when new firmwares drop, you must first reinstall a non edited home menu and then reedit and reinstall the sleep screen edit. But updates do seem to drop less and less often for the 3DS and eventually we'll be on the latest and final firmware for the system, and this issue will not even really be an issue any more.
Regardless, this is what I turned my Sleep Screen into:
If you're curious I use both MikeDubbz and MikaDubbz as screen names. I tried to make my sleep screen a bit informative to the more secretive features that my hacked 3DS has in the event I ever lend it to someone and they aren't sure how to do some of these things.
Regardless, this is what I turned my Sleep Screen into:

If you're curious I use both MikeDubbz and MikaDubbz as screen names. I tried to make my sleep screen a bit informative to the more secretive features that my hacked 3DS has in the event I ever lend it to someone and they aren't sure how to do some of these things.