Another thing not mentioned, which I'd noticed recently after a couple of very poor nights, was feeling very dehydrated. Drinking a lot of water didn't seem to help, and it all went straight through. Some surface level research indicated that it could be a lack of vasopressin, so it makes me wonder if taking a small amount of desmopressin (with sufficient hydration electrolytes) would help take the unpleasant edge off the next day.
