Can headlights left on Automatic drain battery?

What is your question?

I have an 2009 Mini S. Sometimes when I try to start my Mini, it just will not turn over, battery seems dead. If someone jumps me off, it only takes less than a minute or two to start. I have noticed that this happens when I leave the head lights on automatic. Do I need to just purchase a new battery or could it be something else causing this?

What makes this problem better or worse?

It happens when lights are left in Automatic mode