Dr Jill Warner and Prof. John Warner discuss the effect of allergies on sleep quality, including allergens like dust mites, animal dander, pollen, molds, fungus, and food allergies. They emphasize the importance of accurate allergy testing and managing allergies with medications like antihistamines and nasal sprays. Additionally, they highlight the significance of cleanliness, reducing exposure to allergens, and the relationship between allergies and sleep behavior.