Question

explain why we are advised not to sleep in a room having a closed door and a window with the coal burning inside

Answer 1

When coal burns in a closed room carbon monoxide is produced.This poisonous gas has the affinity to mix with the haemoglobin present in our blood and forms carboxyhaemoglobin. This carboxyhaemoglobin decreases the oxygen carrying capacity of blood in our body.Thus the brain gets deprived of oxygen.This leads to suffocation and eventually leads to death.So it is advised not to sleep in a closed room with coal burning inside it.
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Answer 2

no if the fire is extinguse the room tempura will bee hot and our hemoglobine will not work