iMac randomly waking from sleep?!

[will0407]

My imac (alu 20", 2.4Ghz) keeps waking from it's sleep in the middle of the night, and in turn, waking me from my sleep in the middle of the night!

I have a USB mouse and a bluetooth keyboard- I have bluetooth set to 'not wake the computer from sleep mode'. I disconnect my external HD, and my printer and any other peripherals are switched off.

Does anyone know why it'll just turn itself back (and random times) on after I've put it to sleep?

 

[silverblack]

The same thing is happening to my Mac Mini (waking in the middle of a night, two times in the past week).

In my case, I've already checked that it has:
- no scheduled wake/sleep
- 'Wake for Ethernet network administrator access' was unchecked
- Bluetooth was disabled
- my USB wireless mouse and keyboard cannot wake computer from sleep
- I do have Elgato EyeTV 250 plugged in to USB, but it's not new

 

[will0407]

maybe if we get the new imac and mac mini each it'd solve the problem!