This has been coming up in my logs for a long time now. It's pretty creepy and I've been wondering about it, but I've got all kinds of other Apple problems (iphone and MacBookPro) that I still (or they) have yet to figure out. I don't think it has anything to do with sleep mode, or what state the machine is in etc...as it happens everyday, regardless. Or every night I guess?! I am still running Lion btw, haven't updated to Mavericks. But as Paul said, he had updated everything to current and was still seeing messages to Gracie. Is this an intrusion/threat/nearby user running something possibly? Sorry, I'm no IT, obv, but it doesn't take programming knowledge to know that this is quite odd. Not sure what watchdog is or what to do w/the screen shot provided by Esteban.