MacBook Pro keeps waking from sleep on its own

My MacBook Pro keeps waking itself from sleep for no reason.
I had the battery changed for free by Apple (apparently it's one symptom of a problem with the original battery) but it hasn't abated. (Occasionally it won't wake up from sleep too, but that's rare and so not much of a problem). The main issue is its inability to stay asleep.
Anyone else had this? I can't find any advice anywhere else and the Genius Bar at the only store I can get to is always fully-booked.
Any help much appreciated.
Message was edited by: craigie b

Hi craigie, and welcome to Apple Discussions.
In addition to Michael's ideas, there have been some weird sleep issues caused by a System Preference, and although your issue doesn't sound the same, if you run on AirPort (and not Ethernet) I'd check it out anyway:
-Open System Preferences.
-Open Network.
-Click on Built-in Ethernet (note what it says underneath it: Not Connected or Inactive; Inactive is what seems to have caused the majority of other issues).
-Click the - button at the bottom of the window to delete the original Ethernet pref.
-Click Apply.
-Click the + button.
-For Interface, select Ethernet.
-For Service Name, enter Built-in Ethernet.
-Click on Create.
-Make sure your Location is set to Automatic or AirPort (or whatever you normally have it set to).
-Click on Apply and close Preferences.

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