La niƱa winter
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Winter-over syndrome
Psychological condition related to the Antarctic or Arctic winter
Medical condition
| Winter-over syndrome | |
|---|---|
| Midday during a polar winter in Finnmark, Norway.
 Note that the sun has not fully risen.  | |
| Symptoms | Depression, insomnia, hostility, anger/irritability, diminished cognitive performance, mild hypnotic states, irritable bowel syndrome | 
| Duration | 7-8 months (Polar winter) | 
| Causes | Psychological stresses and isolation at research stations in Antarctica and the Arctic in winter | 
| Treatment | End of winter and/or departure from polar regions | 
The winter-over syndrome is a condition that occurs in individuals who "winter-over" throughout the Antarctic (or Arctic) winter, which can last seven to eight months.[1] It has been observed in inhabitants of research stations in Antarctica, as well as in polar bases such as Thule, Alert and Eureka.
It consists of a variety of behavioral and medical disturbances, including irritability, depression, insomnia, absentmindedness, aggressive behavior, and irritable bowel syndrome.[2]
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