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> WTH were the study authors thinking?

They were thinking that they wanted a publishable result.

Unfortunately, little to no difference on sleep between dim e-reader at night vs book and dim light wouldn't get published even though would be really useful to know.

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It would seem to me that "there is no difference with appropriate light intensity settings" would be a much more publishable result? That max. brightness affects sleep is an unsurprising "common sense" result (although still worth doing research over just to verify), but I – and I think many people – genuinely don't know if there's an effect with low light settings (and/or colour temperature settings), and if there's an effect, how large that effect might be. In short: that seems a much more interesting study.

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