Eating healthy costs money. Getting into better shape can also cost a good deal of coin (gym memberships, new running sneakers, etc.). But sleep? That's a freebee, yet of these three primary paths to health and wellness, this is the area where most people carry the most debt.

Not good, say researchers from Stanford University, not good at all. Not if you want to be at your best during workouts ... and just about everything else you do during your hours spent awake. Support for this assertion comes from the University of Lubeck in Germany, where researchers discovered that getting the recommended 7 to 8 hours of sleep a night can help improve creativity and memory.

With the weekend here, do yourself the favor of sleeping in -- providing you have the luxury to do so. Not only will help your performance in the gym and help you unleash your inner Picasso, but a failure to catch enough Z's can also decrease your libido, says a recent Men's Health article.