<P> The REM phase is also known as paradoxical sleep ( PS ) and sometimes desynchronized sleep because of physiological similarities to waking states , including rapid , low - voltage desynchronized brain waves . Electrical and chemical activity regulating this phase seems to originate in the brain stem and is characterized most notably by an abundance of the neurotransmitter acetylcholine , combined with a nearly complete absence of monoamine neurotransmitters histamine , serotonin , and norepinephrine . </P>
<P> The REM phase is also known as paradoxical sleep ( PS ) and sometimes desynchronized sleep because of physiological similarities to waking states , including rapid , low - voltage desynchronized brain waves . Electrical and chemical activity regulating this phase seems to originate in the brain stem and is characterized most notably by an abundance of the neurotransmitter acetylcholine , combined with a nearly complete absence of monoamine neurotransmitters histamine , serotonin , and norepinephrine . </P>
rem sleep is also called paradoxical sleep because
rem sleep is also called paradoxical sleep because
because of physiological similarities to waking states , including rapid , low - voltage desynchronized brain waves
because of physiological similarities to waking states , including rapid , low - voltage desynchronized brain waves