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> Is it anything that deviates from going to sleep when the sun sinks and sleeping through till you naturally wake up when the sun rises? And how does it affec

> Is it anything that deviates from going to sleep when the sun sinks and sleeping through till you naturally wake up when the sun rises? And how does it affect people living close to the poles, where the sun basically doesn't set for 3 months in the summer and doesn't rise for 3 months in the winter. (Scandinavia, Canada, etc)

hackerlight 4y ago
Free-running sleep disorder in the extreme case of no sun and no concerted effort to entrain to sufficiently bright artificial light. "Probably the best study to illustrate the effects of an unstructured life during the Antarctic winter is that of four Greenpeace volunteers over-wintering at Cape Evans Base 77°38′S in 1990 (Kennaway & Van Dorp, 1991). For the entire period of sundown (sun below the horizon for 126 d), all four (three men and one woman) showed free-running rhythms of all the variables studied: sleep, aMT6s, electrolytes, and cortisol. Each person free-ran with their own period initially, although two (a man and a woman) subsequently free-ran with the same period. With the return of the sun, all four resynchronized to the 24-h day." https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3793275/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3793275/