I have the same "problems". I love to sleep and i could sleep all day if i had time...but in the evening i just push myself to stay up late as long as posible. I don't know why, even if i am sleepy i try not to fall asleep. But then on the other hand i love to sleep in the mornings...and even if i slept for 8 hours or more i just feel sleepy and tired. My sleeping rhytm is just so messed up and i can't force myself to change it yet.

Interesting reading :)
Have a nice day.