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Sleep deprivation is the condition of not having enough sleep; it can be either chronic or acute. A chronic sleep-restricted state can cause fatigue, daytime sleepiness, clumsiness and weight loss or weight gain. It adversely affects the brain and cognitive function. However, in a subset of cases sleep deprivation can, paradoxically, lead to increased energy and alertness and enhanced mood; it has even been used as a treatment for depression (see below). Few studies have compared the effects of acute total sleep deprivation and chronic partial sleep restriction.〔 Complete absence of sleep over long periods has not been seen in humans (unless they suffer from fatal familial insomnia); it appears that brief microsleeps cannot be avoided. Long-term total sleep deprivation has caused death in lab animals. ==Physiological effects== Generally, sleep deprivation may result in:〔(【引用サイトリンク】url=http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Sleep_deprivation?OpenDocument )〕 * aching muscles * confusion, memory lapses or loss〔〔 * depression〔 * development of false memory * hallucinations〔(National Institute of Neurological Disorders and Stroke – Brain Basics: Understanding Sleep ). ninds.nih.gov〕 * hand tremor * headaches * malaise * stye * periorbital puffiness, commonly known as "bags under eyes" or eye bags * increased blood pressure〔 * increased stress hormone levels〔 * increased risk of diabetes * increased risk of fibromyalgia〔(【引用サイトリンク】title=The Role of Magnesium in Fibromyalgia )〕 * irritability〔 * nystagmus (rapid involuntary rhythmic eye movement) * obesity〔 * seizures * temper tantrums in children〔 * yawning〔 * mania * symptoms similar to: * * attention-deficit hyperactivity disorder (ADHD)〔 * * psychosis〔(Neural Link Between Sleep Loss And Psychiatric Disorders ). ts-si.org (24 October 2007)〕 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 deprivation」の詳細全文を読む スポンサード リンク
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