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Idiopathic hypersomnia is the label given to sleepy patients who have no clear evidence of known causes of sleepiness such as insufficient sleep, apnea, or narcolepsy. Idiopathic hypersomnia likely includes several specific — yet currently unidentified — disorders. Some have argued that this disorder is more homogeneous, noting that certain clinical characteristics, such as Raynaud phenomenon, are common in these patients.
These authors studied 77 patients who met the following criteria: subjective sleepiness with napping, no improvement after prolonged sleep, fewer than two sleep-onset REM periods on a multiple sleep latency test (MSLT) when performed, no cataplexy, no serious apnea, no significant limb movements, and no other medical or ps…