Everything needs some break so that it may not burn itself out. I suddenly find myself doing a twelve to thirteen hour fasting everyday. It was not my intention at all. I just listen to what my body tells me to do. I eat dinner at around 5 pm, and I have my breakfast at around 7 am. Coincidentally, the 7 am is the hour that stomach starts to work in the Ancient clock.
We know that the daytime belongs to yang, while the nighttime belongs to yin. The daytime is when fu organs, such as stomach, small intestine, large intestine, etc, need to work. The nighttime is when zang organs, such as liver, kidney, and so on, should work since these are yin organs.
What if we make the fu organs work hard at night? Even biomedicine shows that the body cleans itself only when there is a fasting for about nine hours, which means no food entering the mouth for the hours. We should let our body take its natural course.