Hypnagogic Hypersynchrony Sleep Stage

Hypnagogic hypersynchrony first described by gibbs and gibbs 1950 2 is a. Hypnagogic hypersynchrony first described by gibbs and gibbs 1950 is a well recognized normal variant of drowsiness in children aged 3 months to 13 years. The opposite transitional state from sleep into wakefulness is described as hypnopompic mental phenomena that may occur during this threshold consciousness phase include hallucinations lucid.

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In addition the understanding of age dependent characteristics of eeg state changes is essential such as.

Hypnagogic hypersynchrony sleep stage. The hypnagogic state of consciousness during the onset of sleep. Sleep paralysis is a separate condition from hypnagogic hallucinations. However it may occur simultaneously. Sleep paralysis is a state of sleep where a person is physically immobile but mentally.

It can be mistaken for spike and wave or epileptiform discharges generalized interictal epileptiform discharges. Hypnagogic hypersynchrony first described by gibbs and gibbs 1950 is a well recognized normal variant of drowsiness in children aged 3 months to 13 years. Especially in children is hypnagogic hypersynchrony hh. Have you ever had a nap and experienced a strange trance like state in which images colors sounds even dream like stories play out in your mind.

Hypnagogic hypersynchrony most frequently occurs in stage n1 sleep but can be seen in stage n2 sleep when it is called theta hypersynchrony. It disappears in deeper stages of non rem sleep. Hypnagogia also referred to as hypnagogic hallucinations is the experience of the transitional state from wakefulness to sleep. They persist in stage ii sleep but usually disappear in subsequent stages.

Unlike k complexes vertex waves are narrower and more focal and by themselves do not define stage ii. This consists in generalised paroxysmal synchronic symmetrical slow high voltage waves lasting 2 8 seconds which appear in drowsiness and in stage i. Hypnopompic and hypnagogic hallucinations are frequently accompanied by sleep paralysis which is a state wherein the person is consciously aware of their surroundings but unable to move or speak. This state is called hypnagogia a word that derives from the greek words hypnos sleep and agogos leading meaning the state that leads into sleep.

For this reason they are often frightening to a person newly experiencing them. Monorhythmic and paroxysmal hypnagogic hypersynchrony special features of vertex transients and sleep spindles positive occipital sharp transients initial arousal responses and post arousal hypersynchrony.