Sleep Deprivation Effects
26. Feb, 2010 
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study using lab animals, in 2002, showed that REM (rapid eye movement) sleep was needed to shut down neurotransmitters, which allowed their receptors to regain sensitivity upon resting. This facilitated the natural production of brain chemicals (monoamines) such as serotonin, norepinephrine and histamine. These chemicals are mood regulators and can also increase learning ability.
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