Head Wake Up lets you turn on the display by tilting your head up instead of tapping the touchpad. The Head Wake up settings card lets you know if the feature is enabled and what angle to raise your head in order to turn on the display.
Set wake angle
If you find the angle used to turn on the display is uncomfortable or if you find yourself triggering Head Wake Up too often, you can customize the wake angle by tapping the Head Wake Up settings card and swiping forward until you see the Set wake angle action. Select it and then tilt your head to the angle in which you'd like to wake the display. Tap the touchpad again to set the angle.