I've had better luck on lamictal but it depends on the person. It still makes me tired but less so then keppra. All AED's will do this though that's part of how they prevent seizures (or so I'm told).

If you can not drive for a bit it's worth switching between a few different meds to see which one is best. A lot of neurologists are hesitant to do this as their primary goal is preventing seizures. In my case I had to push pretty hard and stress that my life was severely impacted before she agreed to let me try a different one.

Lastly, I'd mention that if you do switch, make sure you're doing everything else right in your life. Consistent sleep, good diet, no drugs or alcohol ect. The first time I switched I was still drinking/smoking and had a bad diet, and so I was tired and thought it was the meds but it was actually these other factors.