Unifying Contradiction

I've tried to go to sleep twice already, but its not working. Everytime I stop occupying my thoughts with other things, my mind comes back to things I don't want to think about, like how great it was to spend time with denizsarikaya last holliday, and how empty it has seemed without her this time.

I'm very, very tired and I just want to get some sleep, but right now my mind won't let me.