Around 3 million people worldwide suffer from narcolepsy or bouts of sleepiness and sleep attacks that can affect their ability to have a normal life. There is no cure for the disorder, and few clues about its causes. But now, a new study suggests it could be an autoimmune disease.

In the journal Pharmacological Research, Yehuda Shoenfeld, a professor at Tel Aviv University (TAU) and a world expert in autoimmune disease, and colleagues describe how they found an autoimmune process in the brain that appears to trigger narcolepsy.

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