In 2006, researchers coined the term “social jet lag” to describe when there’s a mismatch between your biological clock and your social life. This mismatch can not only make you feel tired, but could also be responsible for many of your medical ailments. In fact, researchers link interrupted internal clocks due to lack of sleep to a number of serious mental illnesses. So don’t just view sleep as a luxury, view it as an integral part of your life that benefits you both at your job and in your relationships.