Why does Leopard awaken but then not go back to sleep?

I can understand that there is some process that wakes my Mac up in the middle of the night; Software Update, for instance. But what I do not understand is that if the preferences are set to put the Mac to sleep after a period of activity, and I can observe that the Mac stays asleep for at least that long when I manually put it to sleep, why doesn't it just go back to sleep by itself?

Try:
- Reset the iOS device. Nothing will be lost      
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Reset all settings                            
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup. See:                                               
iOS: Back up and restore your iOS device with iCloud or iTunes
- Restore to factory settings/new iOS device.                       

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    Hi mende1,
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    com.apple.driver.AppleHIDKeyboard          160.7
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    com.apple.driver.AppleHDAController          2.2.5a5
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    Date: Thu, 14 Feb 2013 05:49:55 -0800
    From: [email protected]
    To: [email protected]
    Subject: Why Does Live View In DW Not Work With BC Template?
        Re: Why Does Live View In DW Not Work With BC Template?
        created by Alex Pavelescu in Dreamweaver & Business Catalyst - View the full discussion
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         Please note that the Adobe Forums do not accept email attachments. If you want to embed a screen image in your message please visit the thread in the forum to embed the image at http://forums.adobe.com/message/5072585#5072585
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         Start a new discussion in Dreamweaver & Business Catalyst by email or at Adobe Community
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