I think most people agree there is nothing quite like a good night's sleep. Seven to eight hours of peaceful, non- interrupted Z's usually equates to a happy, energetic, focused, and alert person. Sadly however, it seems as though this blissful phenomenon is becoming more and more of an occasional treat. Whether it is working longer hours, dealing with stress, or struggling with a physical and/or medical ailment, fewer and fewer people report having enough sleep throughout the week. Sleep deprivation not only has a negative impact on cognitive function; it can also have a very strong negative impact on fitness levels as well.