Lights on / Lights off

This is an interesting habit/feature of many Earthlings I've encountered so far:

during what they call ''day'', outside (under natural luminance), or in closed spaces (under artificial luminance), their faces appear featureless and empty, their skin flat and plain and their behaviour conditioned by many patterns in which they happily ravel, thinking it makes their lives easier.

But at what they call ''night'', in spaces where all luminance (both natural and artificial) is gone, Earthlings start manifesting an interesting feature - the inner luminance. In the first phase it comes out of the eyes and builds up in concentric circles, and it's usually the only phase for most of them.
But when the second phase occurs (in those that have too much luminance in them so the body is unable to bear it and has to find another vent through which it will let the excess light out) - it happens through their skin. The skin starts cracking under the burden of light, so the light starts dripping, oozing and emanating through the cracks.

The light they release at night seems to be altering their behaviour completely - they cease to rely on the patterns, they are liberated from every shackles. They are more true to themselves and to others, and all the fear of digging deeply into themselves and uniting with the hidden material buried in there - is simply gone.
When the new day begins, they return to their featureless selves, and at night they start emanating light again, and so the whole cycle starts anew.