Some people with Allergic Bronchopulmonary Aspergillosis (ABPA) have mentioned that they feel worse after sleeping while opening windows at night. Here are some possible factors:
  1. Increased Allergen Exposure Outdoor Allergens: Opening windows can allow pollen, mould spores, and other allergens to enter, triggering respiratory symptoms. This is especially true during certain seasons (e.g., spring and fall).
      Mould Growth: If mould levels are high outdoors, particularly in damp or humid conditions, this can worsen symptoms in sensitive individuals.
  2. Temperature and Humidity Changes Cold Air: Cooler air at night can constrict airways, leading to increased asthma or allergy symptoms in some individuals.
      Humidity Levels: Increased humidity can promote mold growth and worsen respiratory issues, particularly for those with ABPA.
  3. Air Quality Pollution and Irritants: Urban areas may have higher levels of pollutants or other irritants at night, affecting respiratory health.
    Odours: Nighttime activities (e.g., grilling, yard work) may introduce smoke or other irritants into the air.
  4. Nighttime Symptoms Circadian Rhythms: Some people experience more pronounced respiratory symptoms at night due to natural variations in body functions and hormone levels.
      Increased Sensitivity: Allergic individuals may be more sensitive to changes in their environment during the night when they are less distracted by daily activities.
  5. Exposure to Pets or Dust Mites Indoor Allergens: Opening windows can stir up dust or expose individuals to pet dander and dust mites, exacerbating symptoms.Recommendations If opening windows leads to discomfort:
      Keep Windows Closed: Especially during high pollen or mold seasons.
      Use Air Purifiers: HEPA filters can help reduce allergens indoors.
      Monitor Air Quality: Check local air quality indexes, particularly for mold and pollen counts eg. IQAir- Install an APP on your phone that tracks where you are and tells you what the local levels of pollution are.
      Consult a Healthcare Provider: Discuss symptoms and management strategies, including potential adjustments to medication. If you’re experiencing significant discomfort, it may be helpful to maintain a controlled indoor environment to minimize exposure to allergens.

    In the UK, allergy season typically runs from March to November, with different types of pollen causing symptoms at different times. 

    Tree pollen 

    • The first wave of symptoms for some people, usually from late March to mid-May
    • Hazel and birch trees are common culprits

    Grass pollen 

    • The main cause of pollen in the UK from mid-May to July
    • There are usually two peaks, one in early June and another in early July

    Weed pollen 

    • It can start in June and last into autumn
    • Dock and mugwort are common weeds that cause pollen

    Other allergens 

    • Mould can be a problem in late summer/autumn until the first frosts
    • House dust mites and pet allergens can cause year-round symptoms

    Factors affecting pollen 

    • Weather conditions like temperature, wind, and rainfall can affect pollen counts
    • Where you live can affect when and how severe symptoms are
    • Urban areas tend to have lower pollen counts than rural areas
    You can check the pollen forecast on the Met Office website. 
For more details on mould allergy, see Asthma UK

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