So on today question stays not in planes for demarcation for lethargic sleep with dead.

 And therm lethargic almost specialists by not using. Today is saying about hysterical sleep, hysterical lethargica. Data condition is displaying for ache neurotic reactions, in peoples with hysteria suffering is a one form of neurosis. Hysterical lethargica, not common having with physiologic sleep. A normal sleep not keeping, not stopping a day and more/and except when you are tired, stressed, and not slept a few days/. And attack for hysterical lethargica keeping from a few hours till many days, and in rare cases for years. And its interesting patient sleep , and by true, as a calling sleep inside sleep, found it with EEG. If to compare EEG , WHERE registered brain s bio-currents by sleeping person, with EEG OF HUMAN, entered in lethargic sleep, thus and non-specialist finds is differences theirs sharp. And physiologic sleep are separating on two phases. First is slow sleep, with a slow elector biopotentials. The second phase is fast sleep, or parodox , with fast fluctuations with small amplitude. In hysterical,  lethargic on EEG registering a picture for brain's bio currents, matching for condition wakefulness.In different irritations, as noises, calls, light flashes a EEG shows, that brain react to theirs. But externally nothing displaying, patient not waking up, and remove his from lethargica is not possible, waking up is suddenly and unexpected, as an attack begin. And in a few cases hysterical lethargica it precedes headache, weakness, fatigue, and person ,which a not for a short times fallen in lethargica, such is having in clinical practise, by famous symptoms can to predict a beginning for attack. Entering, as specialists share, in lethargic condition accompanied by activation of vegetative nerve system, rising body temperature, pulse often, rising pressure, sweating increasing. Physical characters are such, like a human doing a hard physical work . Describing this, that development of hysterical lethargica is tied always with strong emotional tension. And  for attack precedes a nervous shock, as psychical injury caused his and very hard, but not importance. And in suffering peoples with hysteria, and small home s problems causing non-adequate strong answer reaction.Thus,  through a pathologic sleep, they are turning off, leaving from not decided life s situations. A one patient describes a condition on the attack's time:Am forgot all bad and feeling better. On the sleep time my mum visiting me, hug me, kiss, say, that will help me. A remove from the hard problem happens spontaneously, without active sense taking part a patient. Hysterical lethargica is a one, from expressive , rare displaying for hysterical neurosis, young women are suffering more. And on attack time is checking for arterial pressure stats, breathe his, pulse, when sleep is long keeping as a few days, patient need to feed/if keeping ability to eat/, or enter nourishing substances with drips. And also adding methods for free a urine bladder and bowel.  For fighting patient from rare form hysterical neurosis, I doing curing base disease. Lethargic hysterical is not dangerous for life, and on these dramatic forms, which are sharing and talking are evidences is mythical condition, than real. True riddles for lethargies are harder and interesting, than invented. Nor opened today  are details of this pathologic mechanism.

By Yahno, Candidate for medical sciences.