I can't sleep properly

I don't fucking know why when there is a holiday or weekend, i wake up at dawn and don't sleep again!! Why does my brain do that!!! Is it that i know i don't have to go to work later, so i subconsciously don't feel worried about not sleeping back and i end up awake... idk but its been happening consistently for the past week, and today is not even weekend but i just happen to be off and yes same thing happens!! I hate this.