I think running the water-boiling humidifier at night makes Tina sick in the morning. She was better the last few nights, after forgetting to run it. This morning, after I'd run it last night, was not good. She missed another day at work. Plus, she's been helped by cool or cold things: milkshakes, Icees, ice cream, etc. Warm moist air is probably not helpful.
I will report results, with tests of statistical significance, when they are known.
Thanks for reading!