Periodic somnolence

Japanese: 周期性傾眠症 - しゅうきせいけいみんしょう（英語表記）periodic somnolence

A disease in which somnolence (a state in which the tendency to fall asleep is abnormally increased) lasts for several days to several weeks and repeats at intervals of several months to one or two years. Even during the somnolence phase, the patient is able to eat and defecate, but is lethargic and dazed, and later suffers from amnesia. Even when awakened, slow waves of the basic rhythm are observed on the electroencephalogram, suggesting the existence of a mild disturbance of consciousness at the basis of the somnolence (Takahashi Yasuo, 1965). There is nothing abnormal other than the sleep itself becoming shallower and longer. It is common in young males, and is induced by mental and physical stress such as mountain climbing, moving, or catching a cold. Many patients have a medical history of high fever or head trauma.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

数日から数週間持続する傾眠(入眠傾向が異常に亢進した状態)を数ヵ月から1～2年の間隔で反復する病気。傾眠期にも食事や排便はできるが，無気力で茫然としており，後に健忘を残す。覚醒させても脳波に基礎律動の徐波化を証明し，傾眠の基盤に軽い意識障害の存在を推定させる(高橋康郎，1965)。睡眠自体は浅く長くなること以外に異常はない。青年男子に多く，登山，引越し，感冒などの心身のストレスで誘発される。既往歴に高熱疾患や頭部外傷があるものが多い。

出典　株式会社平凡社世界大百科事典第２版について　情報

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