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The waning light of autumn and the rewinding of clocks can throw just about anyone’s sleep out of whack, at least for a little while. But for people with rare sleeping disorders, the struggle never ceases. Patients with idiopathic hypersomnia (IH)-like Victoria Kirby York of Ft. Washington, Maryland-never feel rested, despite sleeping as many as 11 hours in one day. The disorder is a struggle for patient and doctor alike: Researchers are still trying to uncover IH’s most basic biological mechanisms.