Have you tried the instructions at the link in the beginning of the description for Wakelock Detector in the play store? I can confirm it works on unrooted 4.4.2 using adb and a terminal emulator. There's also a PC app way to do it but I haven't tried that one myself. Both are in that link. I think for the Moto X you have to use the PC app. I don't have 4.4.3 to test that so you'll have to try it for yourself or look up if anyone else says it's working on 4.4.3.