Until recently, I left my iMac (27" late 2009) on all the time. I now want to sleep it when not in use, but also wake it remotely via my AirPort Extreme. All this is working fine. The iMac is set to sleep after 6 minutes.
I have an AppleTV 3 and when powered on (but sleeping) it causes the iMac to wake every ten minutes.
greping for wake in system.log shows a bonjour service connection approximately every 10 minutes. After lots of mDNS debugging I narrowed it down to the AppleTV (there are iPads and phones and other Macs around, it wasn't my first thought). Unplugging the AppleTV proved this - the iMac has been asleep for 8 hours now.
I do have home sharing enabled. This is pretty much all it's used for.
Has anyone come across this before and know what's going on?