Energy settings set on save energy but computer stays awake

I have a MacBook Air 3.2 and have Snow Leopard operating system 10.6.8.
I have the energy settings set on go to sleep after 15 minutes. I have set everything to 15 minutes (computer sleep and display sleep).
But when I don't use the computer, eg. when I go to sleep, the computer stays awake.
I have cable internet (high speed) and I have that plugged into the USB modem.
Do you think that because I've checked "Wake for network access" that the computer doesn't go to sleep?
I don't understand why the display doesn't go to sleep. The light on the screen is as bright as ever all through the night though I am not using the computer.

Do you think that because I've checked "Wake for network access" that the computer doesn't go to sleep?
Shut it off and see!
When all else fails try using PleaseSleep.

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http://windows.microsoft.com/en-US/windows7/What-information-appears-in-event-logs-Event-Viewer
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