The couch made a noise, whether it was a worm

According to what you said, there is no sound when you knock, and after a while there is another sound, but it is quieter, maybe there are rats in it instead of worms, you turn the sofa over to check, see if there are any tear marks, you have to look carefully, because the rats are too cunning, and the very small holes are drilled into them.

Insects don't make a creaking sound!

Are your sofa cushions all sponge? If it's a spring bag, it may ring. What is the structure of the bottom? It is also possible if there is a problem with the quality of the inner frame.

Pull the couch cover apart and check the inside, sponge, bottom. You can see what's going on. It shouldn't be a bug.

If you have a new one, you can consider finding a business to replace, if you can't do it, you can try to do this: find a plastic bag that can fit the whole sofa, put a jar in it, put some formaldehyde in the can, seal it for a few days, it is best to put it outdoors, take it out and expose it to the sun, so that there should be no insects after treatment, for reference only.

It should be a moth, buy a little moth-killing medicine and put it on the sofa.

If you don't sit on it and there is a sound, it's probably worming!

It's a worm, it's not a termite, it's in the wood, and the sound is the sound of it drilling into the wood, so I don't know how to cure it.