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gwern comments on My simple hack for increased alertness and improved cognitive functioning: very bright light - Less Wrong Discussion
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If anyone is curious, my estimate of a potentially similar effect based on the weather would require a self-experiment of only ~70 days. I hope someone does run one.
EDIT: with additional data, the correlation has shrunk and so the necessary n has increased substantially to 1600 days.
Weather has too many confounders.
Birdsong, for example, has quite apparent anxiolytic effects.
Er... yeah. Confounders are why we would be interested in running a randomized experiment in the first place, and hence be interested in issues of experiment design like how many days of data we would need.