Which came first, the sleepiness or the culture? Is there more narcolepsy in Japan?

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I’ve been reacquainting myself with sleep-related issues of late, as half of my current placement is in a sleep disorders team. When looking into narcolepsy, I was intrigued to note that rates of narcolepsy are about four times higher in Japan according to self report than they tend to be elsewhere. This got me thinking about my sleep-related observations from the two years I spent there, and I wondered about differences in the way that sleep seems to be conceptualised in Japanese culture.
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