Why Allergy Symptoms Are Worse at Night
- Posted on: Feb 3 2026
Many allergic rhinitis sufferers note that their symptoms, such as nasal congestion, sneezing, postnasal drip, and nasal itching, are more noticeable at night. This can have a negative effect on both sleep quality and duration.
What are allergies?
At its root, allergies are a problem with the immune system. In this case, the immune system reacts to a normally harmless substance, which is called an allergen. Common allergens include dust mites, pet dander, grasses, weeds, trees, and molds. Exposure to an allergen causes immune cells to release histamine and other chemicals, which lead to swelling and inflammation. When this occurs in the nose, it can result in the symptoms described above.
Why are allergy symptoms sometimes worse at night?
Allergens can vary depending on the time of day. For example, grass, tree, and weed pollens tend to be higher in the morning. This can cause allergy symptoms to peak later in the day due to cumulative exposure. In contrast, indoor allergens such as pet dander and dust mites can collect and concentrate in pillows and mattresses, resulting in increased exposure at night.
The circadian rhythm can also contribute. Histamine activity tends to be higher at night, and because histamine is responsible for many allergy symptoms, nasal congestion, itching, and postnasal drip may become more noticeable during nighttime hours.
Additionally, lying flat on your back can cause mucus to pool in the nasal passages and sinuses, which can make breathing more difficult.
What can be done to treat nighttime allergies?
Reducing exposure to allergens is one of the most effective ways to improve symptoms. Washing bedsheets and pillowcases regularly in hot water can reduce dust mites in individuals who are sensitive to them, as well as remove other allergens such as pollen or pet dander. Allergen-proof covers for pillows and mattresses, and the use of an appropriately sized HEPA air filter in the bedroom, may also be helpful.
If symptoms are more severe, medical therapy may be an option. Allergy medications can be divided into nasal sprays (typically steroids or antihistamines) and oral antihistamines such as Zyrtec® or Claritin®. These medications work by blocking the effects of histamine and reducing inflammation in the nose, but they do not cure allergies. Over-the-counter decongestants, such as Afrin® (a topical nasal spray) or Sudafed® (an oral medication), can be used sparingly and should
not be used regularly or for more than three days. Prolonged use can damage the nasal lining and cause persistent nasal congestion.
Immunotherapy is another treatment option that involves controlled exposure to allergens through injections or oral drops. Over time, this can desensitize the immune system and build tolerance, reducing allergic symptoms and the need for medications. Starting immunotherapy typically requires allergy testing and a thorough history, as well as ruling out other chronic nasal conditions such as sinusitis.
At Sinus and Snoring Specialists, we look forward to helping you gain control of your allergies and improve your quality of sleep. Call or securely text our clinic today at 512-601-0303 to request an appointment. We look forward to serving you!
Tagged with: allergens, allergies, allergy, Allergy drops, Allergy testing, nighttime allergies
Posted in: Allergies, Allergy Drops
