The simplest description is dust mite allergy. As far as I'm aware, this allergy/syndrome that we encounter here in the UK came to light in Japan. Because they sleep on thin mattresses laid onto wooden floors, any mites or other allergens were not so "anchored" as they would be on carpeted floors, and some were therefor inhaled. Symptoms were similar to those experienced here in the UK. They named it Kawasaki Syndrome or Kawasai disease. In the recent past, it was thought that carpet shampooing also caused it. The theory was that allergens floated in the air on tiny, soapy bubbles and were inhaled
That debate seems to have gone away
Safe and happy cleaning:)
Ken
Brmmmm Brmmmm