Sleep mode, Flashing light

Sometimes the little white light flashes and sometimes it stays on....
Here are my settings:
Energy:
Computer sleep, 20 minutes
Display sleep, 10 minutes
Put hard disk to sleep when possible, Yes
Screen saver, 5 minutes
After the computer puts itself to sleep the little white light will sometimes flash slowly and sometimes it stays on. Can someone explain the difference or tell me what it is doing?
iMac Intel Core 2 Duo   Mac OS X (10.4.8)  

Your setting in the Energy Saver pane is for when the Mac is inactive, but if a program is running in the background somewhere the Mac isn't really inactive and won't sleep. Do you have any external periferals connected that could be active? Does Mail check for new email? If Mail checks for new Mail in less than every 20 minutes, that activity will reset the inactivity timer and the Mac won't have a chance to sleep.

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