Oxygen generator AT NIGHT?

Question

for some reason my room is very bad ventilated,

do you think there is a chemical available substance or whatever that will convert my exhausted carbon dioxide into oxygen AT NIGHT?

Answer 1

there are chemicals but they are fairly expensive. unless you have respiratory problems and require bottled oxygen (in which case you should get compressed bottles of oxygen) i wouldn't bother.

Answer 2

put a few plants around your room, INSTANT OXYGEN *high five*