Drowsiness

So I've been on depakote now for a while and I still feel like I'm in a fog on many days. Today, for instance, I slept a good ten hours because I was off. And yet here it is, at 6 p.m., and I'm feeling drowsy and could easily fall asleep if I wanted to. I know this is a side effect of the drug and things have been a lot better since I started it, but I hate feeling like this every day.