Why Do My Allergies Get Worse at Night?

Just as you are about to go to sleep, you may find yourself suddenly interrupted by a wave of allergy symptoms. The sneezing, itching, and congestion make it impossible to rest. "Why do my allergies get worse at night?" you might wonder.

This is a common experience, and you are not alone. Many people find their allergy symptoms intensify in the evening. There are several reasons for this, which we’ll explain in this article.

Why Do My Allergies Get Worse at Night?

Allergies can worsen at night due to several factors. Exposure to bedroom allergens, combined with increased congestion when lying horizontal and mucus secretions from the nose and nasal passages dripping down the throat can lead to post-nasal drip, throat irritation and discomfort.

Managing nighttime allergies can begin with understanding the factors that trigger them. Let's explore each factor in detail below:

Prolonged exposure to indoor allergens

Dust mites, pet dander, and mold are common indoor allergens that can accumulate in bedding, carpets, and upholstery. As you spend extended periods in your bedroom at night, you may have prolonged exposure to these allergens, which can trigger or worsen your symptoms.

Indoor pollen

During spring and summer, tree and grass pollen levels often peak in the evening [*]. This may be due to the accumulation of pollen over the course of the day, which result in higher levels in the evening. Evening also brings changes in humidity and air pressure, which can affect pollen dispersion.

Since pollen typically comes from outside, keeping the windows of your bedroom closed can prevent pollen from entering.

Circadian rhythms

Research shows that histamine levels exhibit circadian variations, with peaks occurring at night and early morning. This pattern is linked to increased allergic symptoms during these times [*].

Sleeping position

When lying down, nasal congestion can become more noticeable or pronounced due to engorgement of the nasal tissue in the horizontal position - an effect that an already inflamed nasal passage is more susceptible to. This results in increased discomfort from allergy symptoms such as nasal congestion, post-nasal drip, and sinus pressure, making it harder to breathe comfortably while trying to sleep.

Nighttime Allergy Symptoms

Nighttime allergy symptoms can disrupt sleep and affect your comfort during the night. Symptoms may vary depending on the allergen, but the most common ones include:

• Sneezing
• Nasal congestion
• Itchy eyes
• Itchy nose
• Itchy throat
• Coughing
• Snoring

These symptoms can definitely make you feel tired the next day due to poor quality sleep. Taking note of them and identifying triggers can help in reducing nighttime allergies effectively.

Related: Why Does My Nose Get Stuffy at Night?

How to Stop Allergies at Night

There are several techniques to help manage and reduce nighttime allergies, though it's important to note that while these strategies can significantly alleviate symptoms, they might not completely eliminate allergies for everyone.

Here are some effective approaches:

• Use allergen-proof covers for pillows and mattresses to prevent allergens from coming in contact with the person using them.
• Use hot water when washing sheets, pillowcases, and blankets. Choose a temperature that is safe for your bedding materials (at least 130°F or 54°C) and effective in killing dust mites.
• Vacuum carpets and upholstery regularly with a HEPA (High-Efficiency Particulate Air) filter vacuum.
• Pollen from trees, grasses, and weeds can easily enter through open windows and doors, so always keep them closed to prevent pollen from entering the bedroom.
• Use an air purifier with a HEPA filter. These filters are designed to trap particles as small as allergens, preventing them from recirculating into the room.
• Keep humidity levels in the bedroom between 30-50% to inhibit mold growth [*] and reduce dust mite populations. Dust mites and Mold thrive in homes with high humidity levels, and bedrooms that have poor ventilation can promote mold growth.
• Take antihistamines or nasal sprays as prescribed by a doctor to alleviate symptoms like sneezing and congestion. Remember to take them as directed by your doctor or carefully follow the medication’s instructions.
• Wash your body and shampoo your hair before bedtime to rinse off allergens. Besides rinsing off allergens, a warm shower before bed can be soothing and promote sleep.
• Use nasal saline rinses to clear nasal passages. They work by washing nasal passages of allergens, reducing congestion, and soothing irritation.

Related: How to Unstuff Your Nose Instantly

When to See a Doctor for Night Allergies

If your allergy symptoms are impacting your sleep or ability to perform daily activities, such as work, school, or social interactions during the day — a doctor can help you find a treatment plan that reduces symptoms.

Moreover, keep in mind that over-the-counter (OTC) medications that are not effectively managing your allergy symptoms is a sign that a more targeted approach might be needed. A healthcare professional can offer specialized testing and a customized treatment plan.

The Bottom Line

Nighttime allergies can be challenging, but knowing the factors that lead to your symptoms is the first step towards effective relief. Strategies like using allergen-proof covers and keeping windows closed can help.

For comprehensive relief from allergy symptoms, consider Allermi — a nasal spray designed to provide full or nearly full symptom relief. Our tailored approach to managing allergies helps you breathe easier and sleep better.

References:

1. Seasonal Allergies | Causes, Symptoms & Treatment | ACAAI Public Website. (2022c, November 7). ACAAI Patient. https://acaai.org/allergies/allergic-conditions/seasonal-allergies/
2. Christ, P., Sowa, A. S., Froy, O., & Lorentz, A. (2018). The Circadian Clock Drives Mast Cell Functions in Allergic Reactions. Frontiers in Immunology, 9. https://doi.org/10.3389/fimmu.2018.01526
3. Suni, E., & Wright, H. (2023, November 8). Mold in the Bedroom. Sleep Foundation. https://www.sleepfoundation.org/bedroom-environment/mold-in-the-bedroom