neurologic disorders
Idiopathic Hypersomnia
Diagnosis of Idiopathic Hypersomnia
History or sleep logs Sleep tests In idiopathic hypersomnia with a long sleep time, the history or sleep logs indicate>10 hours of nocturnal sleep; in idiopathic hypersomnia without a long sleep time, it is>6 hours but<10 hours. In both cases, polysomnography shows no evidence of other sleep abnormalities. Multiple sleep latency testing shows short sleep latencies (<8 minutes) with fewer than 2 REM periods. Typically, patients with idiopathic hypersomnia have difficulty waking up, and when they awaken, they experience a period of sleep inertia characterized by drowsiness, decreased cognition, and motor impairment. 