The Chinese Clock is a concept that relates each of the primary meridian systems to a specific two-hour period during the day when it is most active or available to us. The Liver and Gall Bladder energies (distinct from the organs, per se) are associated with the time from 11pm-3am. The spirit of the Liver, the Gan, is said to wander in the spirit world as you sleep, helping you see the nature of present reality and that of the future. In order for the Gan to perform this function, you must be asleep by 11pm. This will assist you in planning and strategizing effectively. Getting to sleep by 11pm is also thought to make it easier to remain asleep through the night which is essential to overall health.