Enlightenment can be defined in many different ways. It is a movement of self awareness away from our temporary attributes and toward an indefinable "non" self, that is to say, it's still defined by self existence and something of a cumulative presence. It is the forging of all perceived boundaries and definitions of self regardless of whether we are identified with darkness moving into light or light moving into shadow.
When you have lived enough and you know that living better is not going to get you anywhere, then you want to go beyond life; the enlightenment.
May we all attain enlightenment.