Internet addiction disorder (IAD), also known as problematic internet use or pathological internet use, is generally defined as problematic, compulsive use of the internet, that results in significant impairment in an individual's function in various life domains over a prolonged period of time. Young people are at particular risk of developing internet addiction disorder, with case studies highlighting students whose academic performance plummets as they spend more and more time online. Some also suffer health consequences from loss of sleep, as they stay up later and later to chat online, check for social network status updates or to reach the next game levels.