As damontal said, take a nasal steroid, they're awesome. The other thing that helped me was taking Nasalcrom, which acts like an antihistamine, but you can tak

As damontal said, take a nasal steroid, they're awesome. The other thing that helped me was taking Nasalcrom, which acts like an antihistamine, but you can take it long term, and has a localised effect. What you probably have is an issue with your carpet, or some other allergen in your home, perhaps mould. I recently moved and noticed in the bedrooms at night I would get very congested which would affect my sleep. Taking the nasal steroid and the cromolyn gave me instant relief. I had the carpets thoroughly cleaned and bought a HEPA vacuum cleaner, and now no longer have to take the medication. You could also have a dust or dust mite allergy. Using a latex mattress cover can help there.