Well DH re-aquaints himself with the Hoovery-thingy. Plugs it in and pushes it around the bedroom which is where I have the worst of my sniffles and sneezes. Even moves the furniture sometimes. Dust causes most of my problems, 2ndly heat: we ditched the duvet over 25 years ago as a change of temperature sets off the sneezing.
So a Deep Clean in the bedroom really eases symptoms.