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Sleep studies are tests that record the body activity during sleep. They are helpful in identification of sleep disorders. Polysomnography, a type of sleep study, is the gold standard to rule out obstructive sleep apnea. If a home study does not find obstructive sleep apnea, but the patient still complains of unrefreshing sleep and daytime sleepiness, an in-lab polysomnogram may be necessary to find other possible disorders. ==Utility== Sleep studies can help diagnose or rule out: * Sleep-related breathing disorders, such as sleep apnea〔(【引用サイトリンク】url=http://www.nhlbi.nih.gov/health/health-topics/topics/slpst/ )〕〔 * Sleep-related seizure disorders〔 * Sleep-related movement disorders, such as periodic limb movement disorder, which is repeated muscle twitching of the feet, legs, or arms during sleep.〔〔 Sleep studies may be used to diagnose or rule out restless legs syndrome (RLS). However, RLS usually is diagnosed based on signs and symptoms, medical history, and a physical exam.〔 * Problems sleeping at night (insomnia) : caused by stress, depression, hunger, physical discomfort, or other problem〔 * Sleep disorders that cause extreme daytime tiredness, such as narcolepsy〔〔 * Problems with nighttime behaviours, such as sleepwalking, night terrors, or bed-wetting〔 * Bruxism or grinding of the teeth during sleep〔 * Problems sleeping during the day because of working at night or rotating shift work. This sleep problem is called shift work sleep disorder.〔 * Sleep studies can also determine problems with stages of sleep. The two primary categories of sleep are non-rapid eye movement (NREM) and rapid eye movement sleep (REM). Normally, four to five series of NREM and REM make up a night's sleep. A change in this cycle may make it hard to sleep soundly.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「sleep study」の詳細全文を読む スポンサード リンク
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