A new study sheds light on narcolepsy, strengthening the hypothesis that in some people influenza A flu creates an immune response that can go awry and starts to cross-react with hypocretin, reports Thrive Global.

What has been challenging in narcolepsy is that whereas in almost all autoimmune disease autoantibodies can be detected in blood targeting a specific organ, nothing has ever been found in the blood of narcoleptic patients, which has made it impossible to develop a blood diagnostic test.