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Double tap to wake Xperia Z3 means you just need to double tap the screen to turn it on. So, you don't need to press the power button with this easier way. To enable Double Tap to Wake Xperia Z3 and Xperia Z3 Compact do as follows:
1. Open Settings and go to the Display settings
2. Scroll down and make sure the "Tap to wake up" option is marked
3. From now on, you just need to double tap the screen to wake the device up