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Bedsheet Hygiene
You shed a gram of skin and sweat a glass of water into your bed nightly, then breathe over it for seven hours. It grows house dust mites, fungal spores, and old sebum, and the fix costs almost nothing: a weekly hot wash, a zip cover on the pillow, a new pillow every couple of years. What's worth getting right is who needs the strict version, and how not to overpay for silk, copper, and "antimicrobial" bedding that buys you nothing.
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A bed is ideal habitat: warm, damp, dark, fed nightly with skin and sebum. The main tenants are house dust mites, microscopic spider relatives whose droppings carry the proteins behind hay fever and asthma. They need humidity above 65% and die below 50% 1. The pillow is the worst of it: a used pillow holds over a million fungal spores, synthetic worse than feather 2.

Heat kills mites; cold doesn't. A wash at 55Β°C or hotter kills every live mite in one cycle; a cold wash rinses out loose allergen but leaves the mites alive 34. Mite-impermeable covers cut allergen on the pillow and mattress about tenfold, for years 5.

Whether that makes you less sick splits by age. In dust-mite-allergic asthmatic children, encasings cut repeat emergency attacks by 45% 6 and dropped inhaled-steroid doses 7. In adults with established asthma the same thing did nothing; their lungs run on too many triggers for one to matter 89.

The strict lines apply if you have dust-mite allergy, allergic asthma, or eczema or acne flares.

Fabric barely matters; wash temperature does. Cotton is the right default: cheap, durable, breathable, survives a hot wash. Wool holds the steadiest microclimate against your skin overnight 10; polyester pools moisture and ages into fungal scaffold. Silk is the trap: no proven acne benefit, and it can't survive a 60Β°C wash. Copper and "antimicrobial" finishes earn their price only in infected atopic eczema, where silver textiles cut severity 11; otherwise they beat cotton at nothing.

How fast you feel it tracks how much the bed was hurting you. Anyone gets a bed dry to the touch and a morning without the faint stuffiness you stopped noticing 10. The hay-fever sufferer wakes clearer within weeks; the allergic child has fewer attacks bad enough for the emergency room 6. For everyone else the win is slow: less lifetime exposure to proteins and spores you never wanted to breathe.

The fine print β€” when to skip it, and what people get wrong

Cold water is enough: it leaves living mites 3. No allergy, no problem: sensitisation is cumulative; high infant-bedroom mite levels tracked with fivefold asthma by age eleven 12. Encasings cure adult asthma: they don't 8.

The classic miss is washing the case and keeping the pillow: fresh cover, two-year-old fungal core. Damp rooms defeat the whole routine; 70% humidity regrows the colony between washes, so fix the room first 1.

References
  1. 1Arlian LG, Neal JS, Morgan MS, Vyszenski-Moher DL, Rapp CM, Alexander AK (2001). Reducing relative humidity is a practical way to control dust mites and their allergens in homes in temperate climates. Journal of Allergy and Clinical Immunology. link
  2. 2Woodcock AA, Steel N, Moore CB, Howard SJ, Custovic A, Denning DW (2006). Fungal contamination of bedding. Allergy. link
  3. 3McDonald LG, Tovey E (1992). The role of water temperature and laundry procedures in reducing house dust mite populations and allergen content of bedding. Journal of Allergy and Clinical Immunology. link
  4. 4Choi SY, Lee IY, Sohn JH et al. (2008). Optimal conditions for the removal of house dust mite, dog dander, and pollen allergens using mechanical laundry. Annals of Allergy, Asthma and Immunology. link
  5. 5Custovic A, Simpson BM, Simpson A et al. (2000). Manchester Asthma and Allergy Study: low-allergen environment can be achieved and maintained during pregnancy and in early life. Journal of Allergy and Clinical Immunology. link
  6. 6Murray CS, Foden P, Sumner H et al. (2017). Preventing severe asthma exacerbations in children: a randomized trial of mite-impermeable bedcovers. American Journal of Respiratory and Critical Care Medicine. link
  7. 7Halken S, HΓΈst A, Niklassen U et al. (2003). Effect of mattress and pillow encasings on children with asthma and house dust mite allergy. Journal of Allergy and Clinical Immunology. link
  8. 8Woodcock A, Forster L, Matthews E et al. (2003). Control of exposure to mite allergen and allergen-impermeable bed covers for adults with asthma. New England Journal of Medicine. link
  9. 9GΓΈtzsche PC, Johansen HK (2008). House dust mite control measures for asthma. Cochrane Database of Systematic Reviews. link
  10. 10Shin M, Halaki M, Swan P, Ireland AH, Chow CM (2016). The effects of fabric for sleepwear and bedding on sleep at ambient temperatures of 17Β°C and 22Β°C. Nature and Science of Sleep. link
  11. 11Gauger A, Fischer S, Mempel M et al. (2006). Efficacy and functionality of silver-coated textiles in patients with atopic eczema. Journal of the European Academy of Dermatology and Venereology. link
  12. 12Sporik R, Holgate ST, Platts-Mills TA, Cogswell JJ (1990). Exposure to house-dust mite allergen (Der p I) and the development of asthma in childhood: a prospective study. New England Journal of Medicine. link
Related in the handbook (10)
Worsens / aggravates
  • β€” Dust mites in unwashed bedding feed year-round nasal allergies β€” a hot weekly wash cuts the exposure.
Works well with
  • β€” Dust mites breeding in unwashed bedding are a top asthma trigger β€” a weekly hot wash and a mite-proof cover cut night flares.
Related
  • β€” A purifier handles airborne particles, but dust mites live in the bed itself β€” pair it with a weekly hot wash to clear the bedroom.
  • β€” Dust mites need humid air to thrive; controlling bedroom humidity starves them as much as washing does.
  • β€” Damp bedding grows fungal spores you breathe all night. If sheets feel clammy, the room's moisture and possible mould is the bigger fix.
  • β€” Part of the same household-hygiene theme β€” fabric that stays damp and dirty grows what you'd rather avoid.
  • β€” You breathe and press against your sheets for hours, so the detergent you wash them in matters β€” fragrance-free, less dose.
  • β€” The pillow and mattress under the sheets matter too β€” and old pillows are worth swapping every couple of years.
  • β€” The pillow you swap every couple of years is also the one your neck rests on a third of your life. Pick it for support, not just hygiene.
  • β€” Towels and sheets are the same hidden story β€” fabric you press against your skin daily that quietly re-seeds bacteria.
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