arcticpenguin
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http://news.independent.co.uk/world/science_medical/story.jsp?story=422687

Brain scans showed people with two kinds of sleep problem - sleep apnoea, in which the person stops breathing while asleep, and REM behaviour disorder (RBD), which can lead to flailing during dreams - produced abnormally low levels of the neurotransmitters dopamine and acetylcholine.
The lower the levels of the chemicals, the worse the sleep problems were, said a team at the University of Michigan Health System.
...
RBD is less common but more dramatic: patients in the "rapid eye movement" stage of a dream will act it out, moving their arms and legs, getting out of bed, talking, shouting and even hitting or punching things. It can endanger the patient and any bed partner.


