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Sleep is as essential to us as food, air and water. Good sleep each night increases our ability to concentrate, strengthens our immune system, and decreases our risk of being killed in accidents. Unfortunately, not everyone is able to have a good nights sleep. Sleep disorders are among the most common clinical problems encountered in all of medicine. Primary sleep disorders are chronic disturbances in the quantity or quality of sleep that interfere with a person's ability to function normally. Sleep disorders are classified into two kinds. Dyssomnias are primary sleep disorders in which the patient suffers from changes in the amount, restfulness, and timing of sleep. Some examples of ailments in this category are primary insomnia, hypersomnia, narcolepsy, breathing-related sleep disorder and circadian rhythm sleep disorder. Parasomnias, which is the second category of sleep disorders, include those in which people experience physical events while they are sleeping. They are typically characterized by abnormal behavior in association with sleep, sleep stages or sleep-wake transitions. Disorders in this category include nightmare disorders, sleep terror disorders, sleepwalking disorders and parasomnia NOS. Hypersomnia is a condition marked by excessive sleepiness during normal waking hours. The patient has either lengthy episodes of daytime sleep or episodes of daytime sleep on a daily basis even though he or she is sleeping normally at night. People who have hypersomnia can fall asleep at any time: for instance, at work or while they are driving. An adult is considered to have hypersomnia if he or she sleeps for more than 10 hours a day on a regular basis In some cases, patients with primary hypersomnia have difficulty waking up in the morning and may appear confused or angry. This condition is sometimes called sleep drunkenness and is more common in males. The number of people with primary hypersomnia is unknown, although 5-10% of patients in sleep disorder...
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