Keppra and lethargy

I have had temporal lobe epilepsy/ partial seizure disorder since I was thirteen. I was put on Lamictal, serzone, inderal, tegretol and a host of other things for atypical migraine disorder (which we thought I had until I was diagnosed as having partial seizure) and NOTHING got rid of my seizures until I tried KEPPRA. I call it my miracle pill. I take 500mgs 2x day and the only thing I experience is lethargy. I take small naps here and there but nothing that really is debilitating. I may have a lower libido and be slightly dry eyed but compared to the benefits for me it's worth it.