[Lucinda]

Oh, yes it is idiom. To strangle a moose means (as I've recently known) to be strong enough (a man or a rope, etc) to strangle a moose.

But, unfortunately, it still doesn't fit into my context, whisch is: he is sleeping and suddenly beside his head it's like someone strangled a moose. He winces to discover his roommate is snoring. The idiom refers to sound, I suppose, but i'm not sure.

Thanks anyway, your topic is great!