Brief Introduction of Sleep Disorder

Introduction
The field of abnormal psychology study people's emotional, cognitive, and behavioral problems. Abnormal behavior may be defined as behavior that is disturbing, distressing, maladaptive, and often the result of distorted thoughts. Sleep disorder is one type of abnormal behavior that happened around us and people around us in “dot-com” era. Sleep disorders are problems with sleeping, including trouble falling or staying asleep, falling asleep at the wrong times, too much sleep, or abnormal behaviors during sleep. There are two main categories of sleep disorders, which are dyssomnias and parasomnias. Dyssomnias are problems connected with the amount, timing, and quality of sleep. Meanwhile, parasomnias are abnormal disturbances that occur during sleep. The most common type of dyssomnia is insomnia, a chronic condition marked by difficulties in initiating or maintaining sleep, lasting for a period of at least one month. Common symptoms of insomnia include difficulty getting to sleep and waking before it is time to get up. There are many factors that can contribute to insomnia including stress and underlying medical conditions. On the other hand, the second category of sleep disorders, parasomnias includes such abnormal sleep disturbances as sleepwalking. Sleepwalking occurs when the sleepers arise during sleep and wanders about. Common symptoms of sleepwalking include opening eyes during sleep, performing detailed activity of any type during sleep, and talking in sleep and saying things that do not make sense. Sleepwalking most often occurs during deep, non-rapid eye movement (N-REM) sleep early in the night. If it occurs during rapid eye movement (REM) sleep, it is part of REM behavior disorder and tends to happen near morning. The cause of sleepwalking in children is usually unknown. Fatigue, lack of sleep, and anxiety are all associated with sleepwalking. In adults, sleepwalking may occur with alcoholism, sedatives, or other medication and mental