Banned from the Bedroom

I'm thinking about banning Gigi from my bedroom, since I am allergic. However, according to Cat Fancy's May 2007 issue, cat allergens are sticky, adhering to walls, bedding and other surfaces. And, allergens accumulate over time. Carpet (which I have) and upholstered furniture are reservoirs for pet allergens where, according to the National Institute of Allergy and Infectious Diseases, they can remain for weeks. What's an allergic person to do?