So, how can you cure for this winter problem?
In the lounge
Don't for get that the house needs to breath and open windows slightly in the lounge.
In the bathroom
More people having showers mean more water vapour. Run the extractor fan for at least 15 minutes after a shower and keep the bathroom door shut so the damp air cannot migrate into the house.
Doing the laundry
Avoid drying clothes inside - if you must hang them in a spare room with a window open and the door closed.
Use a tumble drier only if it is vented outside or by an open. window
Do nothing but install a PIV from Dryhomes.net and this will automatically keep you dry and healthy.