I really wish joedirt had access to an EEG machine and stuff to do a full polysomnograph..
Theres 4 non-REM stages to sleep where brainwave EEG activity progressively slows from alpha to theta, then delta in stages 3/4; muscle tone and cardiorespiratory tone fall through each till getting to REM where dreaming usually occurs and cardiorespiratory activity increases eg agitated breathing.
Conditions like narcolepsy give a rapid transition to the REM phase without much of the preliminary 4 stages and is associated with crazy hypnogogic and hypnopompic hallucinations.In REM sleep theres a dissociation between muscle tonic activity and whatevers going on in the head/mind so people usually are incapable of moving.
Stages 1-4 and REM are associated with progressive reduction in 5HT/noradrenaline/histamine activity, and REM with a burst of acetylcholine action; this is between the upper brainstem and the hypothalamus/thalamus/basal forebrain and from here to the limbic and cortical parts.
Theres some fascinating sleep-related disorders where the above don't apply eg REM with preserved muscle tone and activity where people act out their dreams, and parasomnias where transition from 1 phase to the next misbehaves giving bizarre effects like night terrors and confusional arousals.
Interesting stuff!
Theres 4 non-REM stages to sleep where brainwave EEG activity progressively slows from alpha to theta, then delta in stages 3/4; muscle tone and cardiorespiratory tone fall through each till getting to REM where dreaming usually occurs and cardiorespiratory activity increases eg agitated breathing.
Conditions like narcolepsy give a rapid transition to the REM phase without much of the preliminary 4 stages and is associated with crazy hypnogogic and hypnopompic hallucinations.In REM sleep theres a dissociation between muscle tonic activity and whatevers going on in the head/mind so people usually are incapable of moving.
Stages 1-4 and REM are associated with progressive reduction in 5HT/noradrenaline/histamine activity, and REM with a burst of acetylcholine action; this is between the upper brainstem and the hypothalamus/thalamus/basal forebrain and from here to the limbic and cortical parts.
Theres some fascinating sleep-related disorders where the above don't apply eg REM with preserved muscle tone and activity where people act out their dreams, and parasomnias where transition from 1 phase to the next misbehaves giving bizarre effects like night terrors and confusional arousals.
Interesting stuff!