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gwern comments on Open Thread, February 1-14, 2012 - Less Wrong
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After 40 days and 40 nights (plus a few), I've finished my little randomized double-blind placebo-controlled vitamin D sleep experiment: http://www.gwern.net/Zeo#vitamin-d
Conclusion: it probably hurts sleep when you take it at night.
Followup: it helps morning mood when taken in the morning: http://www.gwern.net/Zeo#vitamin-d-at-morn-helps