Not only do cooler heads prevail, they might also sleep better, according to researchers who say they have developed a cooling cap that, when worn during sleeptime, may help treat insomnia. Previous research has shown that the brains of people with insomnia are “hyperaroused” and have a higher brain metabolism in the frontal lobes, which helps explain why they have trouble drifting off to sleep and staying asleep, said study co-author Dr. Daniel Buysse, a professor of psychiatry and clinical and translational science at University of Pittsburgh School of Medicine.