TheWinterSnow
Den Mørke Natt
By day a plant consumes CO2 and produces oxigen. At night the process is inversed. You share oxigen with the plant and it, too, expels CO2 (less than a human, though).
Not a good idea to sleep near plants, anyway.
Don't know where you got that information, but plants never consume oxygen as a source in photosynthesis. During the light cycle H20 is used with light energy to make O2 and during the dark cycle, CO2 is used with the organic compounds made during the light cycle to produce sugars. Calvin cycle, ring any bells?
Photosynthesis works like this:
CO2 + H2O = Sugar + O2