IMac dies in it's sleep

I leave my iMac on at night or when I am away. It somehow switches off during that time. I have checked the systemlog for any clues. The only thing I can find is that when I turn it on is this:
Nov 15 08:45:06 localhost kernel[0]: AppleSMU -- shutdown cause = -110
Nov 15 08:45:06 localhost kernel[0]: AppleSMU::PMU vers = 0x000d0054, SPU vers = 0x15, SDB vers = 0x01,
Anyone?

First, are you sure that you don't have a shutdown time selected in System Pref? If not, then try resetting your SMU.
Please post back,
Miriam

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