I've been having grand mal seizures for about ten years now, I'm 30 and they occur in my sleep. When I first started having seizures, they knocked me out for a couple hours, I woke up with the worst headache ever, disoriented and I felt incredibly fatigued. In the past year my seizures have gotten more frequent,(I average about 1 a month) but the ones that I've had haven't been nearly as intense. I still have a little headache, nothing horrible, I'm barely fatigued at all and the disorientation level has dropped a lot. I'm not complaining, but what would cause this?
Seizure patterns can change over time. I had my first seizue in 1970. I used to have aura and vision brown out all the time....almost daily. This would happen almost always in the morning. They got to be less and less and now I hardly ever have them...but when I do they come in clusters and they are not as intense as they were years ago. And they usually happen when I am tired and/or stressed. Especially if the stress and lack of sleep goes on longer than a month or two...it will start to happen. Years ago they would happen regardless of sleep or stress.
Thats something I was never able to learn about, deep neurology and pharmacokinetics (medication acting in the body).
My seizures lost control with the medications that had been working. I needed (well, my Dr's did this) to be placed on other medications to try and regain control that I once had. It took over 6 YEARS to find that control. Why? I can't answer that question. I had control for nearly 15 years when it started to degrade.
Best educated guess is our bodies can adapt or slightly change. Be it in the brain or nerve pathways. Sometimes (in cases similar to mine) our bodies start to become immune to the medications effectiveness.
Why do the seizures become lesser in their intensity? Possibly better treatment, diet, your health, or a combination, or none of those.