Beds, bedding and bedtime toys are also prime triggers for house dust mite reactions. Humans lose on average half a litre Oust under a pint) of fluid overnight, so beds are invariably damp, unless thoroughly dried and aired. Not only do house dust mites love the damp, warm dark of mattresses, pillows, blankets or duvets, with their abundance of human skin scales, but they thrive in other places such as teddies, soft toys, padded headboards and bed-bases.
A damp environment encourages house dust mites. Living close to damp areas significantly increases mite populations: it has been shown that even living over an underground water course can correlate with increased incidence of house dust mite allergy. Rising or penetrating damp in the structure, using humidifiers, drying laundry indoors, having a lot of house plants, using heating such as gas fires or paraffin stoves which create water on burning, can all contribute to an increased population of house dust mites.
Poor ventilation, or failing to ventilate also contributes. Fixed windows, or keeping double glazing or windows tightly shut to conserve heat will stop through draughts, circulation of air and hence drying of the environment.
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