In a sample of 34 perimenopausal women with physiological hot flashes detected from sternal skin conductance measures during overnight polysomnography recordings (n = 222 hot flash events), an awakening occurred within a 3-min window around the onset of the hot flash in 69.4% of events. Sleep was undisturbed in 19.8% of hot flash events, and the remainder (10.8%) occurred when the woman was already awake. Data taken from de Zambotti M, Colrain IM, Javitz HS, Baker FC. Magnitude of the impact of hot flashes on sleep in perimenopausal women. Fertil Steril. 2014 Dec;102(6):1708–15.