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

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Antidepressant medications are sometimes used to treat narcolepsy because they can suppress REM sleep, which can trigger cataplexy. Cataplexy is a symptom of narcolepsy that involves sudden muscle weakness triggered by emotions, so reducing cataplexy can greatly benefit patients with narcolepsy. The anti-anxiety properties of these medications may also contribute to their effectiveness in treating narcolepsy. However, narcolepsy is not inherently caused by depression, so choice A is incorrect. Additionally, while antidepressants may have anti-anxiety properties, this is not the sole reason for their use in treating narcolepsy, so choice B is also incorrect.

The Reason That Antidepressant Medications Are Sometimes Used to Treat