Insomnia disorder is a highly prevalent health condition, affecting
۱۰–۱۵%of the adult population worldwide. A central feature of insomnia is hyperarousal
characterized as persistent and increased somatic, cognitive and cortical stimulation.
Hyperarousal leads to a state of conditioned arousal that disrupts both sleep and
daytime function. Research studies have shown increases in body temperature, heart
rate, electroencephalographic activity, catecholamines, and oxygen consumption as a
measure of metabolic rate. These findings provide evidence of increased physiological
activation in insomnia however results are not consistent. The aim of the systematic
review was to determine ifmetabolic rate in patients with insomnia is increased in keeping
with the hyperarousal hypothesis.