Just because you have a detector doesn't mean it's working right. I've seen shows where they test them and a lot of them either didn't work or didn't work properly (ie went off when the levels were way too high). Do they get headaches anywhere but at your house? they could be suffering from migranes. But you should get your house checked out, call your fire department and see if they'll come and check out your house, and check your detector and other things for you. I know the fire department will do that sort of thing here, but if they don't do that in your area then they should know who will do that for you.
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