like you, chocolateface + spidermama, i too wear foam ear plugs around the house. sometimes i leave them in from the night before (dh snorting/grunting/general breathing too loud in bed)
i just leave them in as long as necessary, they are wonderful and really ease the pain. sometimes i wear them to the school playground in the morning to numb myself against all the crap - brilliant, i just can't hear it.
like now, in school holidays they're essential to block out the 24-7 bickering/moaning/screaming/arguing etc etc.
earplugs coupled with humming to yourself (with mouth firmly shut) is total blockout. brill!