Why does my mac try to wake every two hours when I have put it to sleep?

A question for a newbie, so please forgive me if theres not enough detail. I notice from the Console log that my mac tried to wake every two hours when I put it into sleep mode yesterday evening. The log records the following message "mac error 09/09/2013 02:21:05.000 kernel[0]: Wake reason: RTC (Alarm)" The machine then spends a few minutes logging other activity before returning to inactive mode until the next 2-hour cycle time comes around. Should I be worried about this, or is it a normal Mountain Lion inbuilt routine. If so what's its purpose, and why at 2 hourly intervals?

System Preferences/Energy Saver - check to make sure Wake for network access isn't checked.
If that doesn't fix it, see this discussion for the post by Linc Davis.
https://discussions.apple.com/message/21295414#21295414

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