I M Girl Of Age 25yr. Even After 7-8 Hr

i m girl of age 25yr. even after 7-8 hr of sleep,,getting dizzy when i used to study after having breakfast or anything ..sleep attacks are so much strong that make me almost fall..even when i used to work on computer or attending test..only solution is sleep again for half an hr or more,,pls help me out...sry no money this time..account is empty..wl try nxt time...i m medico..left job for pre pg entrance