Allergies? Maybe your Pillow is to Blame If April showers bring May flowers, what do May flowers bring? Unfortunately for many, the answer to this children’s rhyme is no laughing matter: severe allergies. According to the Asthma and Allergy Foundation, more than 50 million Americans suffer from allergies and almost 60% of individuals with nasal allergies reported difficulty sleeping due to their allergy symptoms. There are many common allergens that can lurk in hidden places — like your pillow.