Being unable to get sufficient sleep can lead many people to be irritable and snappish during their daytime hours. It can also cause concentration problems that make completing even the most mundane tasks such as driving not only difficult but potentially deadly. Left untreated long enough, this can lead to depression and anxiety. The stress of worrying about whether or not they will be able to fall asleep so that they can have a productive day can cause many to experience anxiety can lead to insomnia and a perpetuation of a sleepless cycle. Depression can also be a symptom of not getting enough sleep, and with depression comes a host of side effects that can alter the personality and cause changes in hygiene, concentration, perception and a general loss in interest in the things that once interested the depressed individual.