Home / English / Why does the body become alert and active after sleep? English Why does the body become alert and active after sleep? Posted on12/08/202202/07/2022 Updated on02/07/2022 The body and brain get sufficient rest during sleep and the body recovers from fatigue making it alert and active again. Related posts: What is the most obvious advantage of sleep? What happens to our body when we sleep? Define a dream in your own words? Why are dreams important? Mention two reasons.