A bunch of individual noises (a cow mooing, a dog barking, a bird singing) when occurring at the same time, can be considered collectively to be just noise.
I would only talk about noises when you mean to make a distinction between them either in time or by source.
You were making a lot of noises in your sleep last night.
This means at multiple times during the night you made some noise.
You were making a lot of noise in your sleep last night.
This would more likely be interpreted as you making noise in a more continuous way throughout the night.
I can't think with all this noise.
Here noise means the sum of all noises being heard. (The lawnmower, the traffic, the dog, the television, the neighbors, etc.)
I would rewrite your sentences:
The queen-size wooden bed always makes noise when we lie down on it. We had not noticed this issue until we moved in. Even when I am very careful as I turn over in bed, the noise still annoys my wife and she always complains about it.
[verb] one's way {{in | into | to } [target] | through [hindrance/obstacle]}
is a general pattern where you can substitute different verbs, like "force", "claw", "push", "work", "beg", or really anything that is clearly understandable in the context.
It means, roughly, "Attaining [target] by [verb]-ing, thereby creating a path or entry into [target] (or through [obstacle]) for oneself, where a path or entry wasn't available."
The worm cheerfully munched its way right to the center of the apple. [There was no path to the center of the apple; the worm created one for itself by eating.]
She slept her way into the movie industry. [She had sex with directors or producers in exchange for getting roles in films, thereby creating a way into the industry that was not otherwise available.]
The usage "don't you have to push your way in" is clear: "don't you have to get into the game by means of creating an entry for yourself via pushing?"
"in" is correct, because that's the preposition that is used for indicating participation in a game: being "in the game".
"Push" is also appropriate, because it has figurative meanings, one of which is forcing or asserting oneself. (E.g. an overly assertive person is called "pushy" and "pushes around" other people).
Best Answer
In the context given, the most correct and common way to say it would actually be
Since they are already making noise.
Is correct, though it when used in that particular context it sounds a little strange to my (native, American) ear. If you were in a situation where you wanted to prevent future noise,
or
would both be perfectly fine to use. As far as noise being counted vs non-counted, the difference between 'noise' and 'noises' usually comes down to whether are multiple types or sources of noise. The difference between 'noise' and 'a noise' is usually whether the noise is sustained or brief.
For example, if there is a crowd of loud students in the hallway, you can say:
If there is a crowd students, and someone using power tools you might say
If the hallway is otherwise quiet, but someone loudly dropped a book it would be
You could even use 'a noise' when referring to a sustained noise, though it would usually be coming from a single source, such as a dripping faucet, instead of a group of talking people. Generally, because 'noise' is so flexible, whether you use 'a/any noise' vs 'noise' and 'noise' vs 'noises' the sentence will usually sound correct.