Are you sure it's definitely dust mites only? I'm also allergic to grasses, moulds and pollens, so it's always difficult to say what causes my sniffles. I am also worse with the change of seasons. And nights are worse than days. Carpets, bedding, lounges etc can all carry dust mites, so while a pillow/mattress protector help, there are heaps of other places they'll still be. Classrooms are a haven for dust mites, esp if there are cushions in a reading corner, bean bags. Carpets in schools are always old, aren't they?! I was also worse with too much chalk dust (dustless chalk? Ha!), so basically any small particles. There could also be certain trees at school that make things worse.
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