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Hypnagogia is the experience of the transitional state from wakefulness to sleep: the ''hypnagogic'' state of consciousness, during the onset of sleep. In opposition, ''hypnopompia'' denotes the onset of wakefulness. The related words from the Greek are ''agōgos'' "leading", "inducing", ''pompe'' "act of sending", and ''hypnos'' "sleep". Mental phenomena that occur during this "threshold consciousness" phase include lucid thought, lucid dreaming, hallucinations, and sleep paralysis. ==Definitions== Sometimes the word ''hypnagogia'' is used in a restricted sense to refer to the onset of sleep, and contrasted with ''hypnopompia'', Frederic Myers's term for waking up. However, ''hypnagogia'' is also regularly employed in a more general sense that covers both falling asleep and waking up, and Havelock Ellis questioned the need for separate terms. Indeed, it is not always possible in practice to assign a particular episode of any given phenomenon to one or the other, given that the same kinds of experience occur in both, and that people may drift in and out of sleep. In this article ''hypnagogia'' will be used in the broader sense, unless otherwise stated or implied. Other terms for hypnagogia, in one or both senses, that have been proposed include "presomnal" or "anthypnic sensations", "visions of half-sleep", "oneirogogic images" and "phantasmata",〔 "the borderland of sleep", "praedormitium",〔 "borderland state", "half-dream state", "pre-dream condition",〔Lachman, Gary (2002). ('Hypnagogia' ). ''Fortean Times''.〕 "sleep onset dreams",〔Stickgold, R., interviewed 30 October 2000 by Norman Swan for ''The Health Report'' on Australia's Radio National ((transcript )), retrieved 3 July 2008.〕 "dreamlets",〔Schacter, D.L. (1976). The hypnagogic state: A critical review of the literature. Psychological Bulletin, 83, 452–481.〕 and "wakefulness-sleep transition" (WST).〔(【引用サイトリンク】url=http://www.sciencedirect.com/science/article/B6SYT-4RCN8CP-1/2/eee96a80f27593096fdace6bb9fce440 )〕 Threshold consciousness (commonly called "half-asleep" or "half-awake", or "mind awake body asleep") describes the same mental state of someone who is moving towards sleep or wakefulness, but has not yet completed the transition. Such transitions are usually brief, but can be extended by sleep disturbance or deliberate induction, for example during meditation. 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「Hypnagogia」の詳細全文を読む スポンサード リンク
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