Hey Rainbow! Well the way I see it is the eye is part of the nervous system so there could be some correlation to how you feel with the eye movement. Since you are taking meds that effect your brain it would make all the sense in the world how it all could play a part on some of the symptoms you are having. When we sleep we have REM or NREM and our eyes are still working even when they are closed. The part of the brain that process all this is the cerebrum.
The largest and most prominent part of the brain, the cerebrum governs higher mental processes including intellect, reason, memory and language skills. The cerebrum is divided into 3 major functions:
You have sensory which is the part that receives information from a sense organ like your, eyes, ears, taste, smell, feelings, and translates this information into a form that can be understood.
Then you have the Motor functions which would be all your voluntary movement and some involuntary movement. Which may cause the arm seizures you were talking about.
Then you have the intellectual Function - responsible for learning, memory and recall. When you think about all of this and taking meds that work on your brain it all makes sense as too why someone may have some types of symptoms. Hope this helps!
HUGS
Cher