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by eurg 2676 days ago
"most commonly", but there is some evidence that SAD is not triggered only by amount of light:

"This model also explains the otherwise confusing tendency of some SAD sufferers to get depressed in the summer. The problem isn’t amount of light, it’s circadian rhythm disruption – which summer can do just as well as winter can."

https://slatestarcodex.com/2018/07/10/melatonin-much-more-th...