Fatigue.

Patient: Hello! I am Nanas, I have problems in sleeping.I feel tiered for almost the time. Besides, what’s really bother me is that ,i am a student and i need to be focuced all the time. However, i always let my work undone and i look for excuses to go to sleep. Sometimes i feel an urgent need to go to my bad and just sleep eventhough it is not bad time or it is the mid of the day.I need to know what is the reason behind my problem?

Doctor: