Hey there,
I can't answer you specifically because these meds affect people so differently. However, I would say you need to talk to you doctor. It sounds like you are having a sleep disturbance that can be caused by medication or other health problems. The feelings of being half awake and half asleep (and not being able to move) are actually common when your brain doesn't wake up in the correct order. Definitely wouldn't stress out about it, but at the same time you need to talk to the doc as it isn't fun to experience it and maybe he/she can figure out what is causing it.

Take care