States and events at the border between waking and sleeping, such as hypnagogia, hypnopompia, hypnic jerks, sleep inertia and sleep paralysis. A phenomenon belongs here when its cited article places it at falling asleep or waking up. Every member sits in the Psychology Atlas as its own page with a definition, cited sources and links to related effects, so the group works as a reading path through Sleep-Wake Transition States rather than as a claim that the members share one cause. Where scholars disagree about how an effect should be classified, the member page says so.
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Sleep-Wake Transition States
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Hypnagogia, Wikipedia
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Hypnagogia is the transitional state from wakefulness to sleep, also defined as the waning state of consciousness during the onset of sleep.
Wikipedia: Hypnopompia
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Hypnopompia (also known as hypnopompic state) is the state of consciousness leading out of sleep, a term coined by the psychical researcher Frederic Myers.
Wikipedia: Hypnic jerk
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A hypnic jerk is defined as a brief and sudden involuntary contraction of the muscles of the body which occurs when a person is beginning to fall asleep, often causing the person to jump and awaken suddenly for a moment.
Sleep inertia (Wikipedia)
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Sleep inertia is a physiological state of impaired cognitive and sensory-motor performance that is present immediately after awakening.
Wikipedia: Sleep paralysis
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Sleep paralysis is a state, during waking up or falling asleep, in which a person is conscious but in a complete state of paralysis.
Wikipedia: Microsleep
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Episodes of microsleep occur when an individual loses and regains awareness after a brief lapse in consciousness, often without warning, or when there are sudden shifts between states of wakefulness and sleep.
Wikipedia: Confusional arousal
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A confusional arousal, also known as sleep drunkenness or severe sleep inertia, is medical condition where a person awakened from sleep shows mental confusion for at least several minutes.
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