I'm going back a long way here to bring this up but I had similar attacks before I was diagnosed. At the same time I also felt I moved more slowly than I should have and was more tired than I should have been. It would not last long and then seem to resolve itself. I later found problems looking at groups of people that I was walking towards- they appeared to shudder. I thought I was a bit mental and must have developed a dislike of crowds. It was my eyeballs moving at different speeds. The reality was I wasn't diagnosed and had no strategy to avoid slowly declining.
What you're experiencing might be just a little warning that you should start looking for coincident symptoms like fatigue and looking at strategies to improve your health.
There is no end of ideas about MS attacks and how to manage them.
My ideas are here - regimens-f22/topic24019.html
so I wont repeat them.
If this is your only symptom, then with benefit of two decades experiences I would do the following-
1) always go to bed at the same time even if you're not tired (you can read)
2) Take at least 300mg of Coenzyme Q10 before bed
3) Consider reading a lot more about the sort of stuff I and others write about as you will need to learn the language (gets easier)
4) Review the usefulness of the medications you take
5) Consider what other people have found useful
6) Ask a forum like this a lot of questions