Sleep Disorders, Nightmares and Sleep Patterns

I need help and ideas for these questions. Thank you very much.

QUESTIONS:

What kind of abnormal behavior or physiological event could happen during someone's sleep pattern to cause them to have parasomnias?
Is there a way to over come this disorder properly without side effects?
Do you feel that it is possible that someone could have nightmares every night and not have a sleep disorder?
What about those dreams that you don't remember in the morning, could not remembering those dreams cause sleep disorders?

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.... Sleepwalking typically occurs during the first three hours of sleep, when sleep stages 3 and 4 (non-rapid-eye-movement sleep) are most prevalent, with the episodes usually last 30 seconds to 30 minutes.

There has been one recently proposed possible physiological mechanism underlying sleepwalking. During normal sleep the chemical messenger gamma-aminobutyric acid (GABA) acts as an inhibitor that stifles the activity of the brain's motor system. In children the neurons that release this neurotransmitter are still developing and have not yet fully established a network of connections to keep motor activity under control. As a result, many children have insufficient amounts of GABA, leaving their motor neurons capable of commanding the body to move even during sleep. In some, this inhibitory system may remain underdeveloped-or be rendered less effective by environmental (drugs, alcohol, trauma, toxics, etc.) factors-and sleepwalking can persist into adulthood. GABA (Gamma-Aminobutyric Acid) is an amino acid neurotransmitter (C4H9NO2) in the brain--believed to be involved in muscle relaxation, sleep, diminished emotional reaction and sedation (http://www.sleepdex.org/glossary.htm#r).

On the other hand, night terrors, also known as sleep terrors, or pavor nocturnes are related to the physiological problems here are incomplete arousal from slow wave sleep accompanied by a state of intense fear and agitation sometimes experienced, especially by children, on awakening from a stage of sleep not associated with dreaming but characterized by extremely vivid hallucinations. The person awakens in terror with feelings of anxiety and fear but is unable to remember any incident that might have provoked those feelings. In contrast, people who wake up from nightmares often recall some of the dream. (http://www.sleepdex.org/glossary.htm#r)

2. Is there a way to overcome this disorder properly without side effects?

It depends on the cause of the disorder. If it is genetic, the disorder ...