After a night of poor sleep, you might have noticed a different feeling. Whether that was wheezy, uncomfortable, or confused, it most likely wouldn't have been something you want to feel again. Indeed, poor sleep can significantly and negatively affect our body, mind, and performance. According to William Dement, founder of Stanford Sleep Disorders Clinic, sleep deprivation "is a big problem. What it means is that nobody performs at the level they could perform." Additionally, recurring poor sleep can be punishing, leading to negative long term effects on your health.