The most common and dramatic hallucinations are those that occur just before bedtime or just after or just while relaxing in the prone position. Of course, dreaming is also false perception observed during sleep; however, because we don't watch, they do not usually considered to hallucinations. Similarly, during normal rest we sometimes indulge in various fantasies. But such imagination usually voluntary and hallucination are not considered.

Hallucinations associated with sleep

Hallucinations, sleep related appear usually in moments of wakefulness just before bedtime or after it. Take, for example, such is the case with the young student anthropologist, who later became a famous scientist.

In 1964, as a College student, David Hufford met with a horrible Night Strangler. Exhausted from a bout of mononucleosis and graduation exams, Afford one day in December, I went to the room that he was shot outside the campus, and fell into a deep sleep. In an hour he shuddered and woke to the sound of the opening door - the one door, which he himself locked and bolted before you go to bed. After that, Chafford heard from the door to the bed was heard footsteps and felt the presence of evil. The young man was terrified, he couldn't move a muscle, wide-open eyes froze.

Without any warning sinister creature, whatever it was, jumped to Afford on his chest. Chest tightened under the oppressive weight. Breathing became difficult. Afford felt a pair of arms around his neck and began to squeeze. "I thought I was gonna die," he says.
At this point, power, not giving Afford to move, as if disappeared. He jumped up like a scalded, and ran a few blocks to a student hostel, where he has taken refuge. "Why, mystery, " he recalls with a busy little laugh, " but I told no one about what had happened" (Bower, 2005, p. 27).

This incident occurred with Professor Afforda when he was a student, illustrates some typical for similar situations effects, including hallucinations and sleep paralysis. Just before falling asleep some are auditory or visual hypnagogic hallucinations.

Typically these are people's faces, landscapes, different scenes. This may be pseudohallucinations (which, though seems a real man does not perceive as a real or true hallucinations (perceived seriously). As a rule, hypnagogic hallucinations are static images. They can appear during the day, in the time of weariness or a doze, and the lack of external stimuli, and can be superimposed on that one sees in reality. These hallucinations are relatively common, they often have 37% of the population. Similarly, being half-asleep just before awakening people can experience hypnopompic hallucinations. As a rule, they repeat fragments recent dreams.

Sleep paralysis is associated with sleep dramatic condition where a person just before falling asleep or when you Wake unable to speak or move. Sometimes he feels that "out there" someone or something is there, but unable to move, unable to shout. At such moments, there are often visual, auditory or tactile hallucinations. From a physiological point of view, when we sleep, our body temporarily immobilized, and skeletal muscles (those used for movement, gestures and speech) covers temporary paralysis. That is why we are not trying to put into practice what we see in dreams. In a state of sleep paralysis brain wakes up, gets out of neurophysiological sleep state, but the body is very briefly remains paralyzed.

At this point the person is fully aware of himself and his surroundings, but could not move, and talk, and sometimes to the same experiencing hallucinations, like dreams. Ordinary people sleep paralysis, and gineitiskiu and hypnopompic hallucinations can horrify. Many people experience sleep paralysis only a few times in my life, but with those who suffer certain sleep disorders (narcolepsy), it happens more often. It is possible that many encounters with ghosts, aliens and angels that took place around the world in different times, in fact represent cases of sleep paralysis and tested this creepy horror.