Бомбора - Рецепт хорошего сна. 7 дней до ощущения бодрости после сна стр 5.

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Nathaniel F. Watson et al., «Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Society,» Sleep 38, no. 6 (June 1,2015): 84344, doi.org/10.5665/sleep.4716.

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Ellen R. Stothard et al., «Circadian Entrainment to the Natural Light-Dark Cycle Across Seasons and the Weekend,» Current Biology 27, no. 4 (February 20, 2017): 50813, doi.org/10.1016/j.cub.2016.12.041.