Heart: Is time to sleep
Brain: Hmmmm, I plan to go bed as well.
Few hour later, still cannot fall asleep
Heart: I guess I am in stress as I have no idea what am I worry.
Brain: Hey, heart I think you must calm down and don't be too stress.
Heart: I know but the problem now is I cannot, I do feel pressure because tomorrow want to work!!!
Brain: Huh, do you know what you do is impacting me as well?
Heart: I know as we must have synchronize with each other.