[header] How to deal with being allergic to cats [title] Create a cat-free zone. [step] Your bedroom is your castle. Defend it from allergens at all costs! If you can keep the cat out of your bedroom, you create an (mostly! ) allergen-free zone at night. 
That gives your system a chance to recover overnight. [substeps] If you're looking for a moat to defend your bedroom, consider a hepa filter.