"We know that as many as 6 in 10 cancer survivors have problems of insomnia,
which is up to three times the rate found in the general population." @SoldierCrab pointed out the Survivorship Center a...
Could I also suggest that if you're getting your thyroid tested, get your cortisol levels tested as well. Cortisol is the stress hormone. If it is high and stays high over a long period of time, this can cause all kinds of issues like sleep problems, difficulty in losing weight and generally is not good for your body functions.