I found this article interesting on the Traditional Chinese Organ Body Clock.
http://foreverconscious.com/traditional-chinese-organ-body-clock
In TCM it is believed that each organ has its point of highest energy and lowest energy.
This 24 hour cycle is believed to help us know when to exercise, eat, have sex, rest and sleep. It also acts as a way to communicate with a particular organ or meridian (energy channel) of the body.
It explains why sleeping late and skipping breakfasts are bad for your health from Traditional Chinese Medicine (TCM) perspective:
Sleep hours vary depending on the individual and your age. However it suggests that we all need to sleep at least 6 hours. When you sleep early, wake-up automatically and feeling energetic, that's your sleeping hours. Don't go back to bed or you will wake-up feeling groggy.
The article also recommends time schedules for breakfast, lunch and dinner.
It also recommends no food 3 hours before bed time and that we learn to listen to our bodies and adjusts it to the optimum conditions.
Source: www.foreverconscious.com/wp-content/uploads/2014/01/chinese-organ-body-clock