IMac wakes from sleep at the same time each night

For some reason my iMac is waking from its 'sleep' mode at exactly 21:57 each night. Very odd, but any ideas why this is happening and at this particular time.
It never used to?! I have not set any timer on it.
Ideas appreciated. Thanks.

Hi Barbara,
I have nothing scheduled (thats why i don't get it??) and the only options I have 'checked' are the default options:
Put the hard drive to sleep when possible (which i have tried unchecked too)Allow power button to put computer to sleep
Automatically reduce brightness after power failure
No schedules are set up.
I could understand the blue tooth thing firing up the Mac from sleep mode, but it can't be this waking up at a set time each night of 21:57 ???
Very strange and really frustrating.

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IMac wakes from sleep at the same time each night

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