For some reason since updating Mountain Lion on my hackintosh my computer would mysteriously wake up in the middle of the night. As sleeping and waking had never been 100% I figured that it was just down to a quirk of having a hackintosh. But I did some digging and after some searching and log investigation I found the following entries:

[~]$ syslog | grep -i "Wake"
May 19 00:55:57 : Next maintenance wake [Backup Interval]:  Sun May 19 01:38:25 2013 BST (approx)
May 19 00:55:57 : Requesting maintenance wake [Backup Interval]:  Sun May 19 01:38:25 2013 BST (approx)
May 19 00:56:03 : Wake reason: ?
May 19 00:56:03 : The USB device 4-Port USB 3.0 Hub (Port 3 of Hub at 0x14800000) may have caused a wake by issuing a remote wakeup (3)  

Which lead me to believe it was a config issue, and a quick look through the preferences un-earthed the following:

Disabling “Wake for ethernet internet access” has solved my problems and there haven’t been any phantom wake from sleeps since.