I also have this issue, among many others:
-Apple logo still glows but the screen is off, or sometimes I only have the mouse active on a black screen. The only way around that is to press the on/off button until it restarts.
-Takes more than 30 seconds to exit sleep mode, and some times simply bugs and stays loading for much more time (until I ultimately get annoyed and force restart it).
-Won't turn on after sleep mode. i close the lid, re-open it and it's like the laptop is dead. I have to force restart again.
All these issues (plus that damn scratch I got on arrival) makes me wonder if I should go to the Apple store and buy a new one. I don't want a refurbished, what do you guys think I should do? Can Apple provide a new rBMP 2.3/256/8 ?