The difference between Death and Life.
On a rock they call a planet, that is rotating around stars, the inhabitants deemed a brighter phase "day" and the darker one "night". This isn't necessarily the grandest of differences, so let me explain : During the day you have the individuals who are dead or dying punching a clock to earn money and looking miserable during the act, and during the night you have the life, the energy, and individuals who are looking to find more to life, in others.
Truly an interesting twist on the way things should be, where you'd anticipate the day producing high energy individuals who have found a love for life and a reason to share it are placed in the darkness, and the darkness should be an item where the rest and recovery would be explored by the individuals is given to those that walk in blinding rays of light. How is this possible? I'm not sure, I always seem to have far too much energy regardless of the time of day, today being exception as I actually took rest (Perhaps the volcano eruption of South America required my energy). That's how I would differentiate the two states of a day here on Mother Earth. Our inhabitants would rather live when they should rest ( and are free of judgment) and would rather be resting when life is going on. Not sure that I can explain the need to be this way and I'm not sure that an explanation would do it justice. Other than Day-Dreaming and Night-Life.