Sleep is vitally important for physical and especially mental health! While we have heard about the importance of getting enough sleep, many either choose to forego sleep for temporary "gains" or are hindered by various health conditions. Whether it is staying up late to study for an exam, partying out late on the weekends, or aches and pains, may people cannot get quality sleep. We inherently understand the importance of sleep and feel the "day-after" effects when we don't get enough. Jeff Iliff describes a new understanding of one of the functions sleep has on our mind and brain.