I had that
I had that same type of pattern back in the summer time. But I would go for 3 days and could not sleep then I would nod off and wake up and nod off again to wake up. It was horrible and the fatigue issue was a nightmare. I too saw a sleep specialist. But they really did not find to much. Just noticed that my sleep was being disrupted from something other than sleep apnea.
Mine was caused by a thyroid problem. But they never placed me on speed! I would be scared trying that out. But some people might have no choice. After I got that thyroid surgery, I started sleeping like a lamb and am grateful that issue got solved.
They will do a sleep study on you first and see what your pattern is. Then after that they will tell you what they can do to help you! You might have sleep apnea now and that is what is causing your severe fatigue. Good luck on the sleep study. Hope they can help you feel better! And I hate you are having problems getting that CIDP under control. Hope they can get you feeling better soon! Hugs