"Sick Bed" Redefined

Feeling lethargic and wheezy lately? If yes, spending the day in bed may make matters worse, not better.

Sheets, pillows and other bedding items may contain enough dust mite allergens to cause allergies or asthma, say scientists at the National Institute of Environmental Health Sciences, a part of the National Institutes of Health.

A new National Survey of Americans' Bedding revealed that 45 percent of U.S. homes have bedding with dust mite allergen concentrations that exceed 2 micrograms per gram of dust. That's enough to cause allergy symptoms like headaches, runny nose and coughing. A full 23 percent of U.S. dwellings have dust mite allergen concentrations of 10 micrograms per gram of dust -- a level that can trigger asthma.

Dust mites are tiny insects that feed on household dust, and their fecal pellets and cast skins trigger allergic reactions. To reduce your exposure, use protective bedding and vacuum your home frequently.