How can I fix my sleep schedule?

It’s summer, I’m home from college, and working part time jobs that don’t generally require me to be up early.

On weeknights, I fall asleep between 1 and 2 am. I wake up around 9:30 or 10 and feel like absolute hell. It doesn’t matter how many hours of sleep I get, when I go to bed after midnight I can’t function the next day without coffee or energy drinks. They keep me up until nighttime, and around 8 or 9, I finally feel like a person. I spend the next few hours doing what I love—making art. I’m usually so wired I can’t call asleep until 1 or 2.

How do I break this cycle? If I cut out caffeine, I’m totally dysfunctional, and while I might go to bed early I will have wasted the day.