Time Machine wakes up sleeping iMac every hour - should this happen?

A previous question on this topic is now marked "answered," even though it isn't:
http://discussions.apple.com/thread.jspa?messageID=5687825&#5687825
Here's what happens. I put my iMac to sleep. Then I go to sleep. In the morning, I see that Time Machine has awakened my iMac once an hour to create a backup all night long. I don't believe this is how it should behave, but I see from the previous thread that it's happening on a lot of installs.
Any thoughts on how to prevent Time Machine from waking a sleeping Mac?
Thanks.
Message was edited by: Tim Windsor1

Good point. I was assuming that Time Machine was the trigger. I still think it is, but it's worth looking into.
Given that I can test this only once an hour (at :42, my TM launch time), here's what I'm thinking. Is this the most efficient way to isolate whether it's Time Machine or another process waking the computer.
1. Test One: Turn off Time Machine. Sleep the computer. Wait for :42. If the computer wakes in the next hour, it's definitely not Time Machine. If it does nothing in the next hour, Time Machine could be the culprit.
2. Test Two: Next, turn on Time Machine. Sleep the computer. Wait for :42. If the computer wakes at the appointed time, it's not only possible that it's TM waking the computer, it's likely. If the computer remains asleep, the result is anomalous and tells us nothing.
Anything else I should be testing?

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