In March and April, our body is as a marathon runner on the complex distance from winter to spring. There are some symptoms, which show the spring weakness: sluggishness, frequent colds, circulatory problems, sleep disturbances. It is hard to concentrate in spring. Also forgetfulness increases.
Vitamin reserves are exhausted; free radicals are accumulated, which damage the blood vessel walls. That is why hair loses shine and the skin becomes dry and rough. There is a lot of accumulated (during the winter) melatonin (sleep hormone) in the body, but serotonin (hormone of happiness) is not enough. And all this creates fatigue and weakness.