Medical Definition of hyperarousal
: excessive arousal : an abnormal state of increased responsiveness to stimuli Although insomnia is considered a sleep disorder, its pathophysiology suggests hyperarousal during sleep and wakefulness.—Daniel J. Buysse, The Journal of the American Medical Association, 20 Feb. 2013 Symptoms of hyperarousal refer to physiological manifestations, such as insomnia, irritability, impaired concentration, hypervigilance, and increased startle reactions.—Rachel Yehuda, The New England Journal of Medicine, 10 Jan. 2002
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