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This Week In Wellness a simple eye mask has been shown to improve memory and alertness in as little as 2 nights despite not affecting sleep timing or duration.
https://www.sciencealert.com/wearing-an-eye-mask-while-you-sleep-could-have-surprising-mental-benefits
https://academic.oup.com/sleep/article/46/3/zsac305/6912219?login=true