Research suggests that while an unmade bed may look scruffy it is also unappealing to house dust mites thought to cause asthma and other allergies. A Kingston University study discovered the bugs cannot survive in the warm, dry conditions found in an unmade bed. The average bed could be home to up to 1.5 million house dust mites.
The bugs, which are less than a millimetre long, feed on scales of human skin and produce allergens which are easily inhaled during sleep. The warm, damp conditions created in an occupied bed are ideal for the creatures, but they are less likely to thrive when moisture is in shorter supply.