Ardgion said:
If it is organ-related, it is likely just kidney yang getting exhausted from work. During spring, the liver is more active, so it is possible to feel symptoms pertaining to this. Any organ-specific deficiencies will come with additional symptoms besides just exhaustion. The kidneys are a battery pack for the other organs and are the first to become deficient.
Briefly skim this and see if anything pertains to you:
Kidney Symptoms: https://www.sacredlotus.com/go/diagnosis-chinese-medicine/get/zang-fu-kidney-patterns-tcm
Liver Symptoms: https://www.sacredlotus.com/go/diagnosis-chinese-medicine/get/zang-fu-liver-gallbladder-patterns-tcm
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For supercharging your recovery, I would recommend Yoga Nidra practice, which is basically trance sleeping. You lay down and go into a trance, without falling asleep. Try to go as deep as you can, and go for about 30-45 minutes. Listening to music or anything non-disruptive is fine.
Yoga Nidra promotes a much deeper level of sleep than normal, or in cases of insomnia-like conditions (preventing a good night's rest). It is more efficient than normal sleep, said to be about 3 to 4x as efficient, for people who practice.
Finding the time to do even 30 minutes will allow you to quickly replenish lots of energy. It is basically like focused, maximal recovery.
Lastly, make sure you are sleeping by 11pm. This ensures the highest possible recovery times. Anything longer starts to tax the body pretty heavily. Society does not recognize this, and won't compensate you accordingly.
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Lastly, manage your time so that all your work is done before you become tired. Ideally, you could just come home, clean your aura and do your AOP, then sleep. Then you can wake up and have a large chunk of productive time to do whatever.