Don't be, leaving it sit quietly makes it feel unloved and unproductive and it will fall into a depression...
Just kidding. But seriously, stirring your yeast to keep them in suspension is a good thing, and they do need oxygen to grow up big and strong... Once it's started, it's pretty hard to stop them, and you want to give them every possible advantage. Short of adding chemicals or filtering it, it's hard to "disturb" a fermentation.
"This place is kind of like the most understanding, sympathetic bunch of pushers at a recovery meeting." - xopher425, 2013