Could Polyurethane in mattress make me sick?

I purchased a "Tempurpedic" mattress that was promoted as completely "hypoallergenic." After my wife and I both became ill (dizzyness, headaches) shortly after beginning to sleep on the mattress, which is 100% polyurethane, we conducted a series of experiments that eliminated other sources of toxins, such as carbon monoxide, mold in the air, etc.
I am told by the manufacturer that there has never been an adverse reaction to their beds. I have also learned that the off-gassing of polyurethane (VOCs) can in fact be very detrimental to health. Does anyone have any experience with this type of problem or have any scientific evidence that polyurethane in mattresses could cause dizziness or headaches?
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