Mac OS X: Mac may not sleep when using some Bluetooth mice
Certain third-party Bluetooth mice may "sleep" or disconnect if left idle, to conserve battery power. This may prevent your Mac from sleeping. If you try choosing Apple > Sleep, your Mac may sleep for just a moment, then wake soon after.
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Choose Apple > System Preferences.
Click Advanced... in Mac OS X v10.5 or v10.6 or click the Settings tab in Mac OS X v10.4.
Deselect the "Allow Bluetooth devices to wake this computer" checkbox.
Alternatively, if you allow the Mac to wake, it will likely go back to sleep after the idle interval specified in its Energy Saver preferences.