How can I sleep longer?

Ugh I sware I barely sleep and its really affecting me mentally and physically... Im getting these lines under my eyes, I get tired, my body feels sloppy... but its not my fault, I just can't manage to sleep long.. I sleep for like 5 hours, and I cant go back, sometimes its on and off... (I go to sleep at 11, wake up at 2, then sleep and wake up at 4...etc...What can I do, would sleeping pills help or do they have any side effects? (I'm 17 btw.)