My imac turns it self back on almost immediately after putting it to sleep. Why and how do I fix it?

This is new as of a few days ago. I can't find anything in preferences to make it better nor did I change any setting. Not sure what's going on. The computer seems to be working fine except for that.

It's not supposed to do that, so there is no setting for it. Be sure you have shut down (powered off) the Mac and started it back up, if you have not since this problem occurred.
If you are manually putting it to sleep, make sure you are not "bumping" the mouse immediately after giving the Sleep command. Also, does this happen when the Mac goes to sleep due to timed inactivity?
Resetting the PRAM may help
http://support.apple.com/kb/ht1379
It may also help to reset "power management," which is called PMU, SMU, SMC, and other things depending on Mac model. The reset procedure depends on iMac model. If you can post back with the specific iMac model, I can link to the correct procedure. This is a list of all iMac models
http://www.everymac.com/systems/apple/imac/index-imac.html
A faulty USB device can cause this behavior. You can try disconnecting all USB devices including hubs, except for standard mouse and keyboard (if used). See if the problem recurs.

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My imac turns it self back on almost immediately after putting it to sleep. Why and how do I fix it?

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