It's bad feng shui to keep your door open since it can disturb your sleep when people walk by, and most will sleep less deeply worrying about who may approach them while dreaming.
However, the science is mixed. 1/
https://www.researchgate.net/publication/351422194_Effects_of_Window_Opening_on_the_Bedroom_Environment_and_resulting_Sleep_Quality
https://www.researchgate.net/publication/321212548_Windowdoor_opening-mediated_bedroom_ventilation_and_its_impact_on_sleep_quality_of_healthy_young_adults
However, the science is mixed. 1/
https://www.researchgate.net/publication/351422194_Effects_of_Window_Opening_on_the_Bedroom_Environment_and_resulting_Sleep_Quality
https://www.researchgate.net/publication/321212548_Windowdoor_opening-mediated_bedroom_ventilation_and_its_impact_on_sleep_quality_of_healthy_young_adults
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