We spend about a third of our lives in slumber. Before advances in neuroscience and biology, it was believed that a sleeping person is a passive, dormant being. Now we know that our body, especially our brains work over-time during our sleeping phase, furiously making and breaking neural connections. Sleeping is not just an act of retreat and rest but physical and mental restoration as well. Advancements in science have brought in brain scanning, virtual imaging and other tools to better understand the phenomenon of sleep.