How to stop maintenance tasks starting after mac is shut down?

Even when my iMac is shut down, it starts up in the early morning to perform maintenance tasks, then sleeps. When I have a guest staying in the room with the iMac it wakes them up so I would like to stop it (other than uplugging the power).
The startup initiation message is like the following:
22/12/2013 5:55:12.000 am bootlog[0]: BOOT_TIME 1387662912 0
Is there a way to inhibit this background maintenance operation so that it does not occur when the mac is shut down?
PS It also did this under 10.7 and 10.8 so is not actually a problem specific to Mavericks.

Thanks for the responses.
1. The iMac is actually shut down.
2. There is no wake or startup set in the Energy Saver Schedule.
I've been using Macs since 1985 so I know my way around them pretty well, but I can't figure out this one ...

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