Hey,you have altered sleep cycle ,go to bed and get at right time ,don't sleep in day time ,avoid coffee ,tea in night ,don't watch TV ,computer while sleeping , do exercise daily in morning , don't worry too much...I think you should know that human body require atleast 6-8hrs of sleep.. Without that a person will be irritable, drowsy, difficulty in recollecting recent things if severely sleep deprived, peeson feels easy tiredness... So I suggest you to do some morning brisk walking, meditation and yoga to destress...There are certain hospital which has sleep clinics who can address your issue kindly visit that center... Good luck...