Related links and more informationSummary of why light is key to better sleep: from Sleep Foundation: https://www.sleepfoundation.org/bedroom-environment/light-and-sleepVery good article on light here:   https://io9.gizmodo.com/why-we-need-to-sleep-in-total-darkness-1497075228 Matthew  Walker TED talk - describes optimum temp (65f / just over 18c) and body's need to drop temp before and during sleep. https://www.ted.com/talks/matt_walker_sleep_is_your_superpowerAlso check that series of mini-talks for TED https://www.ted.com/series/sleeping_with_science  Search “Flex by Do Something Different” on the app store or visit https://dsd.me  

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