The Chou Period indicates the time between 1:00 a.m. to 3:00 a.m. The liver channel is on duty during this period. It is important to sleep well during this period if not, one would not be able to keep one's liver healthy.

In the Chou Period, it is the turn for the Yang in the liver to grow. What is the Chou Period like? From the Chinese character of the word Chou, it looks as if one's hands are being bounded and drawn in, and it means that even when the liver's Yang is developing, you still need a little restraint; it also signifies a rise and fall action that is controlled by the liver. In order to maintain a good liver constitution (or keep a healthy liver blood supply function), one has to sleep well between 1: a.m. to 3:00 a.m. Usually when people always wakes up during this period of time, Chinese medical doctor will suggest cleansing your liver so as to calm you down and sleep better.