I should add a TLDR for LessWrongers interested in sleep patterns: if you are having trouble sleeping, you should consider temperature as a variable, perhaps more so than light. Napping was not a significant factor, but was present. Segmented sleep was not observed in this study. Sleep times were longer in the winter than in the summer by an average of 53 minutes.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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