Today I had a user complaining about self-powering-on laptop in the night. Apart from normal causes (sleepwalking?), we can check why the laptop woke up with two simple commands:
Wake History Count – 1
Wake History 
Wake Source Count – 1
Wake Source 
Type: Fixed Feature
C:\Users\tode>powercfg -devicequery wake_armed
Dell ControlVault w/o Fingerprint Sensor
And the mystery solved!
Who’re you gonna call? not ghostbusters….