MBP keeps waking up (for a few seconds) with lid closed and in sleep.

My macbook pro, with the lid closed and hence in sleep, will periodically turn on. As in, ill be laying in bed trying to sleep, ill hear the sound of the fans and hd etc turn on, and then ill see the lcd light up.. itll do this for 4 secs, then go back to sleep. Every 20 mins or so it will do this.
What the hells wrong with it ?

Do you have any USB devices attached? Any Bluetooth devices tethered and nearby? Both of those can wake the MBP... Bluetooth can be set not to wake (System Preferences > Bluetooth), but for USB the only way is to unplug them before you close the lid. If you have Ethernet connected, uncheck the box to wake for ethernet administrator access in System Preferences > Energy Saver > Options tab (in Power adapter settings) .
Hope this helps...

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MBP keeps waking up (for a few seconds) with lid closed and in sleep.

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