Is my sleep cycle F'ed up?

During school if fell asleep around 12 and woke up by alarm 7:30. Now it's summer and I go to sleep at 3 in the morning waking up between 9-12noon. This time however I got 2 hours of sleep and I had a full sleep with all the stages including Rem. I still remember my dream, and now I can't fall asleep this night.