Hello I am 20yrs of age, male, no previous medical history , and I rarely visit a doctor . I am posting this out of my better judgment. I do not know exactly what it is I have but my symptoms are as follows. I have a hard time sleeping sometimes, sleep at 6am wake at 9am and feel absolutly fine and alert. But then there are days when I can sleep by 4am and dont wake till 4pm and I feel extremely tired still and have a hard time removing myself from bed. I dont know what it is I dont think its Insomina please help me I need to know if this will effect my future career.