My 2012 mac pro seems to have insomnia. When its sleeping it seems every 5-10 minutes it wakes itself up and cycles the superdrive--presumably to see if there is some disk in it, and goes back to sleep. I think I cured this on my 2010, but I can't remember how I cured it. I have used lingon and don't see any apps that have timed wake-ups, so my chief suspect right now is the time machine backup. Surely the time machine knows to leave it alone when its sleeping. Any thoughts? Its not in and of itself a big deal, but when this sort of thing happens, I wonder about some sort of malware phoning home or some such. PS. Just turned off 'wake on lan', maybe that's it.