Another effect of lack of sleep is performance. Countless studies have been done on students who do well in tests. In these studies, it is noted how much sleep the student gets. It was found that students who get more sleep generally do better on tests than those who do not. Those who are tired do not feel like doing anything. It is hard for them to make good decisions, think through things, and stay alert, which can lead to to problems in the future. It has even caused adults to lose their jobs, or students to fail classes.Sadly, it doesn't look like there are any positive or helpful effects of lack of sleep in performance. It is scientifically proven that not enough sleep hurts the individual’s performance. When people don’t get enough sleep, one negative effect is performance.