Why Many Experts Advise Against Sleeping With the Window Open at Night

Allergens You Can’t See (But Your Body Can)

Outside air carries more than just oxygen.

When a window stays open overnight, your bedroom can fill with:

  • Pollen
  • Dust particles
  • Mold spores
  • Urban pollution

For people with allergies, asthma, or sensitive airways, this can quietly ruin sleep.

Symptoms don’t always feel dramatic:

  • Mild congestion
  • Dry throat
  • Itchy eyes
  • Subtle breathing discomfort

Even small irritation forces your body into a low-level stress response.

And stressed bodies don’t sleep deeply.

Experts warn that spring and fall are especially risky due to pollen levels.

And then there’s something even harder to ignore — sound.

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