Mystery plant (Ground orchid)


The plant vibrates its leaves during night continuously and by daybreak it stops its motion.Can anyone please explain the science behind this?
Please don’t say it is because of wind as it is very obvious that the nearby plants are standing still.Also I have witnessed this by my own eyes and I know that it is not because of wind.
It also seems that it can be because of the air trapped inside the leaf,but I’m not sure.
It can also be some kind of supernatural phenomenon,but I don’t know what.
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