Is there any evidence to suggest that anti-allergy bedding actually helps with asthma at night? I've had allergy testing and dust/dust-mites aren't a problem but I'm getting really fed up with the occasional nurse/hospital consultant I come across who can be quite dismissive and suggest I just change my bedding/get special allergy pillows etc. I'm thinking of getting them, just so I can say, yep, done that.
I live in student halls where the bedding, pillows, duvets etc are all provided and laundered for us so they may be quite old/dusty. I've been given permission to buy my own (there's fire regulations etc that can be a problem) but I don't want to waste my money if it won't make any difference.
If they're helpful, are the cheapest brands ok because there seems to be a huge variation in price/claims/etc.