Well, I'm not sure if they have APIs to allow for displaying something in the sleep screen (the one you pull down from the top on the lock screen). If so, it would of course be nice. If the phone is connected to the power at bedside, it might be possible to just leave the screen on and display it as a fullscreen app. Not sure if it's that useful in tht case, though. (Shameless plug: One of my other apps, gPodder, is available for BB10 if you want to give it a try..)