Sleep Deprived

I have a horrible problem going to sleep, throughout the day I can be exhausted, but then at night time I become wide awake and can never go to sleep before 1 am. Or then there are the nights like this past friday when I am hanging out with awesome friends and I just never want the night to end so I stay up for hours, I didn't leave Mary's house until 2 am and it takes about 35 minutes to get home and then we had to clean up our house cause our parents were coming home so Chris and I were up til like 4 and then went to bed and woke up at 8 to go to work it's insane and the crazy thing is I would have stayed there even later if I didn't have to clean up the house, I think I may be a little mental! So last night I said "I'm going to bed early I fell asleep at 11 and woke up at 730, 8.5 hours of sleep woo hoo, that is more than I have gotten in a long time, the strangest thing is I am more exhauseted today than I was Saturday morning after 4 hours of sleep at most I don't get it! I have weird sleeping patterns that confuse me! Is 8 hours too much sleep for me IDK, all I know is I am crazy tired today, and I have like no energy!