Question

why we are advised not to sleep in a room with closed windows and doors

Answer 1

due to closed windows and doors air donot pass in room . thus concentration of carbon dioxide increase this is Why we are advised not to sleep in a room with closed windows and doors 
hope this helps

Answer 2

yes....this statement is right becoz if the windows are closed with doors in a room . there will no exchange of gases exhaled from our lungs which is CO2 ....and at a time there will be less amount of O2 will remain which is dangerous to us ....

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