During the dark the plants give off carbon dioxide. ...its during the day they take it in.
Apparently they used to remove the plants from hospital wards at night because of this. There's probably a name for it.
Mushrooms do the opposite and give out carbon dioxide during the day and oxygen at night so keeping those bags in when lights are off may not be ideal.
Yeah, C02 enrichment only helps with lights on. I've tried a few methods to increase CO2, but, if you're space isn't sealed, temps dialed in for it,,, ya might be wasting CO2.
My bloom room is sealed and next summer I may get a CO2 room controller,,, but, from the guys I talk to, commercial types.... It's not the magic bullet most think. Gets expensive, have to deal with tanks,.increase fire and safely hazards....
I'd try the bags if I got them free,, otherwise I just hang in my room lights on and fart.... Haha