Sleep should be a time of peace and relax. But for some people who experience sleep disorders, sleep can be a scary thing. What are sleep disorders that scary?
  Here are 10 sleep disorders are considered to be frightening for the sufferer :

• Nightmare disorder
  People with this disorder often wake up with nightmares and bad memories of a cold sweat in a terrible dream. It will also interfere with quality of life. Because some of them may be afraid to sleep.
  Stress and sleep deprivation is a major trigger of a nightmare. According to the American Sleep Association (ASA) some medications also can trigger nightmares. In severe cases, counseling or tranquilizers may be needed to relieve the anxiety that underlies a nightmare.
• Sleepwalking
  About 15 percent of adults sometimes wake up and amble around the house is still in a state of sleep. In children, the numbers are even higher.
  Sleepwalking can be triggered by stress, not sleeping soundly, and genetics. People who are sleepwalking can do anything. They understand the direction, can move the furniture or the door.
  A study published in 2003 in the journal Molecular Psychiatry, found that 19 percent of adults are sleepwalkers injured while performing their night attack.
  Falling is the greatest danger, so if you have a habit of delirium and walking during sleep, experts recommend that you remove the power cord and keep the bed from a ladder.
• Night terror
  Screaming, thrashing, panicking, and pacing are symptoms of people suffering from night terrors. Unlike the nightmare that occurs 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.
  The exact cause is unknown. But a fever, irregular sleep and stress can trigger night terrors. Fortunately according to ASA, night terrors will decrease with age.
• Drowsiness hallucinations
  We're usually see strange things in dreams. But what if we see it when you're not dreaming? This is called a hypnagogic hallucination that occurs during the transition from waking. People who experience hypnagogic hallucination usually hear noises or see strange things in their rooms. 
• Exploding Head Syndrome
  Exploding head syndrome does not really blow up the head. This disorder occurs during deep sleep, when people suddenly wake up with a startled by a loud noise and sharp.
  No pain or danger which occurs in this syndrome. Exploding head syndrome the exact cause was unknown, but believed it is associated with serious diseases. 
• Sleep Paralysis
  During sleep, activity and body muscles become immobile. This temporary paralysis, although sometimes paralysis persists even after the wake. Usually sleep paralysis accompanied by hallucinations. People who experience sleep paralysis feel crushed and suffocated. 
• Rapid-Eye-Movement
  REM sleep behavior disorder occurs most often in older adults, and can be a symptom of Parkinson's disease, degenerative neurological disorders. 
• Sleep disorders associated with food
  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 stove. 
• Seksomnia
  Seksomnia or or Sexual Behavior in Sleep (SBS) is a sexual habit that occurs when a person is sleeping. Seksomnia can interfere with (sexual moaning loudly), harmful (adverse masturbation) or even criminal (sexual assault or rape). 
• Insomnia
  Insomnia is difficulty or inability to sleep peacefully. This can cause irritation and lack of concentration during the day, and long-term sleep deprivation can really be dangerous. Lack of sleep has been linked to obesity, high blood pressure and heart attacks, among other bad symptoms.