astonishing change in the chemical cocktail of your brain that
takes place during REM sleep. Concentrations of a key stress-related chemical called
noradrenaline are completely shut off within your brain when you enter this dreaming sleep state.
In fact, REM sleep is the only time during the twenty-four-hour period when your brain is
completely devoid of this anxiety-triggering molecule. Noradrenaline, also known as
norepinephrine, is the brain equivalent to a body chemical you already know and have felt the
effects of: adrenaline (epinephrine).
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