MacBook Pro won’t sleep automatically — no process preventing sleep according to pmset. What’s going on?

Solution 1:

Do you have Bluetooth turned on and if so, in the advanced tab of the bluetooth preference panel to you have the checkbox checked that allows bluetooth devices to wake your computer?

I had a similar problem and found that my magic mouse was preventing hibernation with the lid open.

Solution 2:

I made two changes:

  • Disallowed bluetooth devices to wake up computer;
  • Uninstalled google notifier.

Now the computer will sleep