How does a stomata work during the night time?
Check this out
What you want to look up is CAM photosynthesis pathway.
Just to clarify the stomata don't need anything special to operate, it all depends on which pathway is being used and what the enviromental conditions are around the plant. Basically the only reason the stomata will close is to prevent water loss.
So I think what will answer your question is that stomata work during the night, in some plants, by storing CO2 for future use. (more energy is necessary to introduce it to the Calvin Cycle)
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