If you have a hard time facing Mondays, your problem may be a lack of purpose.
Behavioral researcher John Calhoun performed an experiment with mice that was designed to study the effects of overpopulation. He set up a biosphere that was essentially a Garden of Eden for rodents. They were given everything they needed to thrive: shelter, open space to run and play, and unlimited food and water. Even their bedding was routinely changed to provide an ideal nesting environment for baby mice.