* persistent problems falling asleep
* affects 10% of the population
* suffer from sleeplessness and may fall asleep at unpredicatble or inapporpriate times.
* directly into REM sleep
* less than .001% of the population
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* a person stops breathing during their sleep.
* wake up momentarily, gasps for air then falls back asleep.
* very common, especially in heavy males
*sleep disorder characterized by high arousal and an appearance of being terrified.
* Occur in stage 4 not REM, and are not often remembered
* sleepwalking is a sleep disorder afftecting an estimated 10 % of all humans at least once in their lives.
* sleep walking most often occur during deep non-REM sleep (stage 3 or stage 4 sleep) early in the night.
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