I suffer from insomnia, and have recently increased my doses of Thyroxin and Carbimazole, which has made it worse.
I also suffer from awful breathlessness, so that is interesting about your husband, Canalboatgrandma. I am seeing my endo again in January, so plan to insist we discuss this properly, as in the past he has brushed the breathlessness aside, but it is really affectingly life.
I have been told (by friends, rather than medics) that you should take thyroxin first thing, with water and no food (ie no tea, coffee or breakfast) for an hour afterwards. It's not exactly practical if you have anything to do in the morning, though.