Allergies can be a nuisance at any time of day, but for some people, they tend to get worse at night. This can lead to difficulty sleeping, which in turn can cause fatigue and other health problems. But why do allergies seem to flare up at night?
One reason is that people spend more time indoors at night, which can expose them to indoor allergens such as dust mites, pet dander, and mold. Additionally, people tend to sleep with their windows closed at night, which can trap outdoor allergens like pollen and pollution inside the bedroom. This can lead to a build-up of allergens in the air, making it difficult to breathe and causing other allergy symptoms.
Another reason why allergies may be worse at night is due to the body's natural circadian rhythms. According to a Medical News Today article, "levels of the hormone cortisol, which suppresses inflammation, are naturally lower at night than during the day." This can cause allergy symptoms to worsen at night, as the body's natural defences are not as strong.
Circadian Rhythms and Allergy Symptoms
Allergy symptoms can be worse at night due to a variety of factors, including natural circadian rhythms and environmental allergens.
Role of Corticosteroids
One reason for this is the body's natural production of corticosteroids, which are hormones that help to reduce inflammation. Corticosteroid levels are highest in the morning and gradually decrease throughout the day, which can make allergy symptoms worse at night.
Sleep-Wake Cycle
Another factor is the sleep-wake cycle. During the night, people spend more time lying down, which can lead to increased nasal congestion and difficulty breathing. Additionally, the body's immune response is stronger during sleep, which can cause allergy symptoms to become more severe.
To alleviate allergy symptoms at night, it is important to identify and avoid allergens as much as possible. This can include using air purifiers, washing bedding regularly, and keeping windows closed at night to prevent pollen and other allergens from entering the bedroom.
Overall, understanding the role of circadian rhythms in allergy symptoms can help individuals to better manage their allergies and improve their quality of life.
Environmental Factors
Allergies can be triggered by various environmental factors that are often present in the bedroom. Some of the common environmental factors that can make allergies worse at night are discussed below:
Bedroom Allergens
Bedrooms can be a breeding ground for allergens such as dust mites, pet dander, and mould. Dust mites are tiny creatures that feed on dead skin cells and are commonly found in bedding, pillows, and carpets. Pet dander, on the other hand, is made up of tiny flakes of skin shed by cats, dogs, and other animals. Mould can grow in damp and humid environments, such as bathrooms and basements, and can cause allergic reactions when inhaled.
To reduce exposure to these allergens, it is recommended to use allergen-proof bedding and pillow covers, vacuum carpets and floors regularly, wash bedding and soft toys in hot water, and keep the bedroom free of clutter.
Ventilation and Humidity
Poor ventilation and high humidity levels can also contribute to allergies at night. When the air is stagnant, allergens such as dust mites and pet dander can accumulate in the air. High humidity can also encourage the growth of mould and dust mites.
To improve ventilation, it is recommended to open windows and use fans to circulate air. Maintaining a humidity level between 30% and 50% can also help reduce allergens in the air. A dehumidifier can be used to reduce humidity levels in the bedroom.
Overall, by taking steps to reduce exposure to allergens and maintaining good air quality in the bedroom, allergies at night can be reduced.
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