Good free e-book on sleep
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This guide is by a team of scientists in Australia who are working on green light glasses (re-timer) to set your circadian timing, and it's got a lot of good information on sleep. Price is right too.
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Oh I've got one .... Go to sleep Read by Samuel L. Jackson.
Edit, Amazon gives you ONE free audiobook when you download audible.
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I hope you're not making a serious comparison, timpster. lol
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Which Windows, version of f.lux, and what's your graphics card (and driver version)? there might be some clues in those answers.
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@lorna if you have time, I'm interested in the interface you're seeing to reply to posts, a screenshot would be just dandy.
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Oh good lord, this again.