The cloud knows when to release the raindrop. It is not a thinking kind of knowing, it is a being kind of knowing. It is simply following the law of gravity. Water molecules condense to form droplets, they collect to form a cloud. When the cloud becomes too heavy, the droplets fall as raindrops. The cloud has released. Ta-dah.
There is an inherent wisdom to every cycle in nature. The lungs inherently know when they have reached capacity and they release; no need to think about it… leave that to the autonomic nervous system… your autonomic nervous system. You have so many guidance systems at your disposal, so many opportunities to bask in the knowing.