What Does Oxytocin, the “Love Hormone,” Have to Do with Narcolepsy?
A new study published in Nature Neuroscience identifies an oxytocin-responsive brain pathway involved in socially triggered cataplexy in a mouse model of narcolepsy. The findings highlight an often-overlooked aspect of cataplexy: for many people, episodes occur not just when experiencing emotions, but during social interactions.
What is Cataplexy?
Most people have never heard of cataplexy, yet it’s a major symptom of type 1 narcolepsy. Cataplexy involves sudden episodes of muscle weakness usually triggered by emotions such as laughter, exhilaration, surprise, or anger. The severity may vary from a slackening of the jaw or buckling of the knees to falling down. The duration may be for a few seconds to several minutes and the person remains fully conscious (even if unable to speak) during the episode.
During REM (dream) sleep, human brains naturally “switch off” our voluntary muscles so we don’t act out our dreams, as this would be quite dangerous. Cataplexy is believed to occur when this same REM muscle paralysis briefly happens, but while a person is awake and conscious.
What Did Researchers Discover?
Scientists already knew that cataplexy involves activation of the brain’s REM muscle paralysis circuit and that GABA neurons in the central amygdala play an important role. What remained unclear was which specific neurons help trigger this process.
Using a mouse model of narcolepsy, researchers reunited mice with familiar cage mates after a brief separation—a positive social interaction known to trigger cataplexy. They identified a specific group of oxytocin receptor-expressing GABA neurons that became active during these interactions and connected to the REM muscle paralysis circuit.
When researchers blocked this pathway, socially triggered cataplexy was greatly reduced. They also found that a highly rewarding experience, feeding the mice chocolate, also activated the same pathway.
The Social Context of Cataplexy
Through Project Sleep’s Rising Voices Story Sharing program and Coping with Cataplexy Toolkit, we’ve heard many people describe cataplexy during subtle social moments—not just strong emotions. While this study was conducted in mice, it identifies a brain pathway activated during positive social interactions, offering an intriguing biological clue that aligns with these lived experiences.
As a graduate school hall director, I once had to confront students during a loud dorm party. As I was telling them to turn off the music and show their IDs, my cataplexy started flaring up. I had to tell them, ‘I have a condition called cataplexy. You’re making it flare up right now—please just follow my directions.’”
– Katie Mehin
Rising Voices speaker living with narcolepsy type 1 (with cataplexy)
via Coping with Cataplexy
I think so much of cataplexy is around communication, irony, interpersonal connections, inside jokes with close friends, stuff like that. For example, in law school, people were talking loudly in the library one night. If I approached them with annoyance, thinking, ‘They should know better,’ I couldn’t do it without having cataplexy. But when I reframed my thinking to remove the judgment, thinking, ‘They just don’t realize,’ I was able to do it without cataplexy.”
– Julie Flygare
President & CEO of Project Sleep
via Coping with Cataplexy
Get the Coping with Cataplexy Resources
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Looking Ahead
While more research is needed to understand how these findings translate to people, it highlights the value of bringing together scientific research and lived experience. We hope this fascinating study sparks more discussion and research into both the emotional and social triggers of cataplexy.
Study Reference:
Mahoney, C.E., De Luca, R., Joyal, A.A. et al. Oxytocin promotes socially triggered cataplexy. Nat Neurosci 29, 1931–1941 (2026). https://doi.org/10.1038/s41593-026-02352-7
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