IMac reboots every day at 5:56 AM

Recently my work hours changed, so I'm now up at 5:30 AM instead of 6:30. Because of this, I was able to observe that my iMac G4 - sound asleep as I recently was at this hour - reboots every day at 5:56 AM precisely. Obviously some timed script is running, but I can't figure out what it is, where it "lives", and how to stop it. I have the Cocktail utility, so I ran the daily "cron" script - but the system did not reboot. The only things connected to the iMac are speakers, a Lacie 250 GB Firewire HD, and a M-Audio Keystation 49e USB keyboard (not powered on). I have no idea how long this has been going on since I've never been up this early until recently. Anyone have any ideas on what could be causing this?

Problem solved - and boy do I feel stoopid!
After checking out all the suggestions offered, I went to visist the iMac in question (located in the "family" room in the basement) at 5:54 AM this morning, coffee in hand. At precisely 5:56 AM (by my watch) the UPS shut down for a moment and then turned back on. The UPS battery is obviously fried, so the UPS shutdown/restart "reboots" the iMac (set to restart after power failure). Since the iMac is in the basement, I must have missed the warning beeps that signal battery failure. So what causes the UPS to restart at 5:56 AM? I had this experience years ago at a firm located in an industrial park - some nearby factory had machinery that started up the same time every day - heavy duty stuff - and it sent a huge "spike" down the line which wrecked havoc with out network backups. I suspect the same thing here - something "heavy duty" goes on-line at 5:56 AM and creates a power "spike" (or whatever) - the UPS senses the "spike" and shuts down to "spare" the devices connected to it, but since it can no longer provide power while it's off, it effectively "reboots" the iMac.
Solution - buy a new UPS!
Thanks to all who chimed in - sorry it wasn't something more exotic!
Robert

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