Sleep is for relaxation and recreation, and goes through two stages - of REM sleep and deep sleep. But when you lose the boundaries between these two stages and the process of waking, sleep is terrible.
In practice, some sleep disorders are like excerpts from horror movies. One of the most common sleep disorders are nightmares. Whether it's an ax murderer or you're naked in the middle of the street, it will surely wake you up, and you're drenched in sweat.
In such cases, people suffer during the day because a constant fear of the forthcoming horror at Midnight pursues them. According to the American Association for sleep, main reasons for this sleep disorder is constant stress and lack of enough sleep.
About 15 percent of the population suffers from somnambulism and occasionally walk out of the house or outside, without waking. Scientists state that a deficit of sleep, and stress are to blame for this.
Twenty percent of sleepwalkers, however, suffer from injuries during midnight walks. The biggest danger is a sleepwalker to fall, so the floor must not have wires and objects.
Night fears are not only worries for people who suffer from them, but those who have them near in such moments. Unlike nightmares, which occur during deep sleep, nighttime fears arise at the beginning of the night.
Most often they occur among children. At the moment of suffering from nighttime fears, they are subjected to another attack, they are in an upright position with eyes open and do not realize what was happening.
In such cases the person screaming and must not be calmed, nor awakened. This condition is similar to sleepwalking, as you walk about ten minutes, then go to bed, sleep and the next day not remember anything.
Carotid hallucinations occur in the transition from wakefulness to sleep, once your head relax on the pillow. When hallucinations reach a zenith, the sufferer wakes up, while seeing strange creatures in the room, and hearing voices.
Most often this happens to people with narcolepsy - a disease of the nervous system, characterized by daily bouts of sleepiness and compelling episodes of sudden sleep onset.