Sleep should be most activities create a comfortable and relaxed. But when someone is having trouble sleeping, everything is turned into a not unpleasant. Check out 10 of the most frightening sleep disorder, as quoted by LiveScience.

1. Nightmare
Nightmares like a criminal being chased or falling from a height, often makes you wake up suddenly during sleep. People with nightmare disorder are usually awoke in a cold sweat and a horrible dream memory. According to the American Sleep Association (ASA), stress and lack of sleep is a major trigger nightmares. The easiest way to get a good night’s sleep is shower and sleep on time.

2. While Sleep Walking
Sleepwalking affects more than 15 percent of adults, whereas in children, the numbers are higher. No one knows the causes of sleepwalking, but stress and other sleep disorders are often the trigger factor. One study published in 2003 in the journal Molecular Psychiatry found that 19 percent of people sleepwalking ended with injuries from falls.

3. Exploding Head Syndrome
This syndrome is not really blow up the head. This disruption occurred at the beginning of deep sleep, when people suddenly woke with a start due to hear loud and sharp as the sound of explosives. Toned voice as if it is next to your head. No pain or harm that occurs in this syndrome. The exact cause of exploding head syndrome is not yet known, but believed it is associated with serious illness.

4. Hallucinations When Drowsiness
Usually you often see something strange when you’re dreaming, but what if you see it when not asleep? This is called a hypnagogic hallucination, disturbance that occurred before you sleep. According to Neil Kline, sleep expert and spokesperson for the ASA, many people who hear voices, feel the presence of ghosts or seeing strange objects in their rooms.

5. Night Terror
Screaming, thrashing, panicking, and pacing are symptoms of people suffering from night terrors. Unlike nightmares that occur during sleep, night terrors occur usually occurs early in the evening. This usually occurs in children. People who experience night terrors will suddenly sit up straight, eyes open, even though they did not do the view. Fever, irregular sleep and stress can trigger night terrors. Fortunately according to ASA, night terrors will decrease with age.

6. Sleep paralysis
While we were sleeping, all muscle activity will automatically be silent, not moving and could be called ‘lame’. Although temporary, but not rare when you wake up you also can not move the body. In a 1999 study in the journal Journal of Sleep Research, Sleep paralysis is usually also accompanied by hallucinations. In the myth, Sleep Paralysis, commonly known by ‘squeezing supernatural beings’.

7. Motion Ball Eyes Sooner or Rapid Eye Movement (REM)
Sometimes the brain does not ‘deliver’ the message correctly in order to quiet the body while sleeping. When dreaming, a lot of people who do things like he is doing in the dream, such as punching, kicking, clap or cry. This disorder often occurs in older adults, and can be a symptom of Parkinson’s disease, degenerative neurological disorders.

8. Eating While Sleeping
People with this disorder will eat at night. Usually people who experience it will lose a bit of memory on the next day. Some cases quite dangerous, because they could have used a knife or a lit stove. According to health experts, a drug with dopamine content can help to overcome sleep disorders similar to those.

9. Seksomnia or Sexual Behavior in Sleep (SBS)
Seksomnia is sexual activity a person does in his sleep. The disorder is performed outside of consciousness. This disorder is generally experienced by men. Seksomania that interfere with sexual moans usually a hard and dangerous like masturbation. However seksomania can also lead to criminal acts, ranging from sexual assault to rape.

10. Insomnia
Insomnia is difficulty or inability to sleep soundly. This can cause irritation and lack of concentration during the day, and long-term sleep deprivation can be really dangerous. Lack of sleep has been associated with obesity, high blood pressure and heart attacks, among other bad symptoms. Based on the National Highway Traffic Safety Administration, driving while drowsy causes 100 thousand car accidents and 1,550 deaths each year.