The condition is often called the rep-repan is often assumed by the presence of demons that occupy the human body so that we are unable to move. Rather than be associated with this mystical, sleep paralysis is more accurately described as a medical disorder that is caused by lifestyle. What we need to know from this syndrome?
Sleep paralysis also known as Old Hags Syndrome is a condition when someone feels the burden when sleeping on your back. People are feeling paralyzed and unable to move or speak. This occurs when the mind is awake, but the body is still asleep.
Every culture, it has its own explanations associated with it. Still, sleep paralysis is not harmful to health, not mental illness. This occurs when the body is asleep, but awake and conscious mind around it. When feeling paralyzed, the muscles we are also asleep, and the only thoughts that wake. Under these conditions, respiratory muscles are also sleeping, causing shortness of breath. Patients also felt increasingly squeezed and experienced tightness in the chest.
If you feel hallucinating about something while experiencing sleep paralysis, it is normal especially if you previously did was a bad dream. Perceptions of psychiatric disorders is also something wrong. The experts also insist that this phenomenon actually physiological condition and not a mental illness.
source: (http://www.mediaindonesia.com/mediahidupsehat/index.php/read/2011/03/04/3777/13/Lumpuh-Tidur-tidak-Berkaitan-dengan-Mistis)