Sleep deprivation disrupts our brain cells' ability to communicate with each other, leading to temporary mental lapses that affect memory and visual perception. A study was conducted on people deprived of sleep in which they were tested on their ability to perform a task. Performing the task grew more challenging as the patients grew sleepier. As the patients slowed down, their brain cells did, too. When sleep deprived, neurons respond slowly, fire more weakly and transmissions are dragged on longer than usual. This phenomenon suggests that select regions of the patients' brains were dozing, causing mental lapses, while the rest of the brain was awake and running as usual. It was proved that inadequate sleep exerts a similar influence on our brain as drinking too much. And it was found that sleep deprivation correlates to a risk of depression, obesity, diabetes, heart attacks and strokes.