I realized that I am a sun-dependent person and I feel happy only when I see the sun. If the sky is covered with a gray veil, the same appears in my soul. During this period I just want to wrap myself in a warm blanket and do nothing. But when the first rays of light break through the clouds, energy and strength to live appear at once. 
It was an incredible discovery for me that the weather can have such a strong influence on a person's energy. Because I had not noticed it before. 
I wonder how many of us are like that?