Our dog started thyroid replacement therapy about ten days ago.
It seems to have "kicked in."
She had a couple of days and nights with almost no sleep.
Before starting on treatment, we think she was averaging close to 20 hours of sleep a day.
The two nights she didn't sleep, my wife and I didn't sleep much either.
She spent the nights "wired", drooling, hyperventilating, panting, looking out all the windows and drinking a lot of water.
The vet agreed that we needed to cut the dose.
She slept through the night last night...and so did we!