According to the Hong Kong Standard, injected allergen shots are nearly 80 percent successful when it comes to curing children under the age of five of their hay fever symptoms. By honing in on the specific allergy that a child has - commonly pollen in the West and dust mites in Eastern countries - doctors are effectively able to forcibly stimulate the immune system into responding to the substance.

"Most of the patients will have allergic response 30 minutes after the injection," Marco Ho Hok-kung, a physician at the University of Hong Kong, told the news source.

After this reaction, however, the body's immune system begins to acclimate itself, eventually developing a tolerance to the allergen, effectively curing the child of his allergies.

If you're trying to keep your little one comfortable and happy as you consider whether to go through with this treatment yourself, consider using pillow covers and a box spring encasement to keep allergens at bay long enough for him to fall asleep. By maintaining healthy sleeping habits, it will be easier for your child to get through the day and deal with their allergy symptoms.