I am not asking what is cone cells. My question is that during asleep rod or cone cells activated? Why and how? This question has not been answered yet! Don't worry! You can check out similar questions with solutions below What is the difference between rod cells and cone cells?What is the use of rod cells and cone cells? What are the differences between rod cells and cone cells?? ... what is the difference between rod cells and cone cells? ... defect of cone cells. So what if the rod cells are defected ...