But , in the sleep - deprived brain , the amygdala seemed to be " rewired , " coupling instead with a brain stem area called the locus coeruleus , which secretes norepinephrine , a precursor of the hormone adrenaline that triggers fight - or - flight type reactions 但是,在剝奪睡眠的大腦中,杏仁核看起來似乎是由腦干的藍斑重連接起來的,藍斑分泌去甲腎上腺素? ?一種觸發了對抗類型反應的腎上腺素前體。