The reason that antidepressant medications are sometimes used to treat narcolepsy is that

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Antidepressants are sometimes used to treat narcolepsy because they can suppress REM sleep, which can trigger a symptom of narcolepsy called cataplexy. Cataplexy is a sudden loss of muscle tone often triggered by strong emotions, which can be dangerous for narcoleptics, so suppressing REM sleep can help reduce the occurrence of cataplexy.

The Reason That Antidepressant Medications Are Sometimes Used to Treat