Yes, I believe I had the same issue. I went to turn it on this morning and it was stuck on the screensaver. No response on any of the hardware buttons while trying to reset. I held the power button for about a minute, while plugged in. Flash, and then the screen that says, "your NOOK's battery charge is too low to power on."
This is weird, as I did a full charge yesterday and it usually lasts a couple of weeks on a full charge, based on my usage pattern. However, I believe this has something to do with the screen saver, as noted by others before, it must have been running down all night.
I'm relieved. I thought I had bricked it for sure.