Odd query about an odd experience

Well, that's the limit of my pest knowledge.
I wonder what's in there?
I would have my Stanley blade out by now..

I'm a 'bruxist' and my teeth don't make a high pitched noise when I'm asleep, as far as I know.

I like mice. We have a huge cat! The mattress that the sounds emit from is foam and there's a cotton cover over it. If it was mice that would be very noticeable but doesn't tie in with the noise and no noticeable bulges in the mattress.

I found out quite a lot about mice when I had some in my flat.
I could hear them squeaking, which everyone thought was hilarious, considering how deaf I am, and the one in my bedroom would brux; meaning he was content, apparently!

Bruxism is tooth grinding! In humans it would be recommended that they have a mouthguard fitted. Teeeny ones for mice?

'Bruxing' - a new word to me!
I hate waste but think I'd take the mattress to the tip.

They squeak too.. in between bruxing.

A nest of wee mice??

Its called bruxing..

I think mice make a particular noise.
I can't remember the name of it, but I think its them grinding their teeth!
(I know, it sounds ridiculous even to me)
I'm off to Google in a minute to find out if I've made this up in my own head!

I just want to bin it but DH doesn't want to waste the money!!

Fumigate it just to be sure or put it out side on a very very cold and frosty morning!!!