[Vulkanevsel]

I think you can get a spray on foam stuff, that expands after spraying.

Probably do the job, check a hardware place.

oh that might be like the tyre filler stuff?

I'll go and ask.
Taa
I know it is a silly thing but it is the kind of sound that travels around (say) a caravan park.
Having snored all night, adding that would be cause for a verdict of justifiable homicide I reckon.