Karnonnos said:
This does explain a lot. For me one of the biggest problems was not mental in this sense, but rather feeling physically depleted. A very simple cure for this is SATANAS which is excellent for re-energising.
If you need more physical energy, make sure you are doing your yoga, such as the hatha yoga (yin) routine, and some form of yang yoga, such as the Tibetan 5 Rites or the Kundalini yoga.
Additionally, make sure your water intake is around 70-90oz per day, not counting exercise, dependent on body weight. Water flushes the cells, but it also acts a medium for energy within the cell, therefore more water = more energy. Thirst is not a reliable indicator of hydration, you need to consciously track it.
Eat only whole foods, make sure you eat roughly double the non-starchy vegetables as your meat intake, for proper proportions. Include some starches or grains at about 1/4 of your plate. Eat beans in place of meat for at least 1 meal a day if you can. Beans are easier to digest, are very nourishing, and are also less heating than animal meat. They also directly aid the kidney organ system. For more info on this dietary plan, please search "TCM dietary guidelines".
Additionally, eat your largest meal for breakfast (when you stomach is most active, according to circadian rhythm) and the smallest meal at dinner time, when the stomach is least active. Don't snack before bed. This tip right here goes a long way at countering evening tiredness, as a large meal at dinner time can easily sap your leftover strength.
Don't drink caffeine products during the morning, as this is when the kidneys are actually the weakest. The kidneys should put off enough cortisol to get you out of bed (assuming you slept long enough). Forcing them at this time of day can put some pressure on them. Try to sleep in longer if you can. Should go without saying, but don't sacrifice sleep for anything, it never pays off.
Anyway, hope some of this helps.