Ds' dust allergy seems to be more easily triggered recently and it takes very little to bring on his wheeziness and coughing overnight. Touch wood it's never been too horrendous (like some dcs asthma) but, I think, it does regularly affect his quality of sleep.
We seem to just about manage to keep it under control at home but whenever he stays away he often really suffers - mainly, I suspect, through using duvets and pillows that have been pulled out of a cupboard or sleeping in a little used spare bed. He has had to come home late at night a couple of times because he was so wheezy and couldn't sleep.
How do other parents deal with this when dcs stay overnight at friends? I can hardly insist on intensive hoovering and washing all bed linen, etc!! Yet he also wants to be able to stay at friend's houses.