Good Sleep Pattern?

I now seem to wake up around 5:00am every morning, and after lying in bed for a while and fully awake and ready to get up by 5:30am. I don't know if this is a result of going to the gym more often or because I have been going to bed between 10:00pm and 11:00pm pretty consistently for the last few days. Hopefully I will be productive on the mornings I wake up this early and don't go to the gym but that remains to be seen. (It might mean more writing of blog posts though!)