What kind of magic user !

Bry that's called seasonal affective disorder. Even my dog is that way. Its very common. People are naturally in a better mood when it is sunny (very rarely it's the opposite).

You may want to know that, because if you have a severe case it can be treated with light therapy which has been proven to help considerably in many people. The sun's benefits are greater than just a light source, it does effect our mood.