We all agree to the fact that sleep is a crucial part of our daily lives and itβs not healthy to cut down on your sleep. Every living thing is aware of this fact and is enamoured of it, but you would not believe that the Scientists still do not have a definite answer to the question: Why do we Sleep? However, there are several theories that have taken place such as our brain needs rest and sleep plays a significant role in creating memories and helps to learn.