Cytomel would be advisable only if your FT3 test result is out of balance with FT4 and is too low in the range. How about posting your thyroid test results and reference ranges shown on the lab report and let members comment further.
As a hypothyroid who suffered insomnia for decades, supplemental iodine solved the problem.
Iodine supplementation can be very tricky with hypothyroidism, especially if the cause is Hashi's, which it is for most of us in the developed world. I'd move very carefully with iodine.
I was dx. with Hashi's and had a CAT with iodine contrast a few years back. I almost died on the table because of it. Not trying to scare anyone but I would be very careful with it and the Hashi. I always tell the hospital now that I am allergic to IVP dyes now to avoid any problems.
The contrast of iodine is different than supplementing - however - if you are rearing in Hashimoto or ANY autoimmune antibodies the effects of both can be bothersome to critical.
No - Iodine may not be the answer here at all for sleepless-ness. Let go back to the Cytomel thoughts.
First thing/ first! - You must get your labs done to see where all these thryoid levels are at. Make sure you are clear to the office that you want the Free T3 and Free T4 tests done on the next draw with the TSH - do not get anything but those done.
In the spectrum of thyroid patients - the Free labs say alot and can further better treatment to eliminate symptoms. The Free T3 lab is usually high - the Free T4 is mid - to high and the TSH is usually low - sometimes marking a "false hyper" in the lab result but not truly the case in the condition.
Your one a failrly hefty dose of T4 meds so I can assume that if you are having this issue the Free T3 is not at your correct level and most likely the case of why you aren't sleeping. Another reason would be a conversion issue off your meds. Another could be a magnesium deficiency. All these thing intertwine off how and what meds you may need to take to help you the most.