[Fey]

So, sadly, that second behaviour? You sorta caused it. Not in a 'oh my god terrible pet owner!' way, promise.

Animals are about action and results. The sun comes up, mom puts food in my bowl. So the sun=food. This is a benign example, there is nothing the cat can do to make the sun come up faster, so it just waits(sucks as the seasons change though). You, however, have a negative example.

In the cat's mind it goes like this: If I make noise/play on the shelves my owner will get up and give me attention. So, noise/shelves=attention. Every time you get up to 'stop' the cat the cat's behaviour is being reinforced, it's being told that it's idea was right. Yelling, scolding, negative things don't come into play in their logic. It's still attention, good or bad, they're right. So it'll continue the behaviour as long as it gets the results it wants.

This means that YOU not the cat have to change. (this is the hard part, trust me, I've trained lots of cats out of these sorts of things*) So, this can be attacked in two ways. Find another behaviour the cat does that you LIKE and lavish attention on them when you see it. This can be paired with your second(first) issue, being on everything. Any time you find the cat on the floor give it LOTS of attention. Pet it, play with it, give it small treats(not too many!), make the cat think that floor=all the love!

In tandem with that STOP giving it a reaction at night when it's on the shelf. Yes, this is the hardest part. Let the cat knock things over, make noise, whatever it chooses to do, but DO NOT react. Stay in bed, stay silent and stay motionless. It will take a few nights, but the cat will eventually realize that noise/shelves =/= attention.

It will take time, there is never a 'fast' solution with animals, but your cat and you are smart, just learn to 'talk' to each other and you'll fix it!

((*Trust me, this is coming from a woman who had to teach a geriatric cat to not claw at her leg and a kitten to stop digging to China in his liter box at three in the morning. I thought I was a HORRIBLE mother, but in fact just didn't know how to 'talk' to them.))

Edit:
And to answer the actual question you asked first: No, being on the furniture isn't a behaviour issue UNLESS you/your family don't want the cat there. Cat's by nature like to be up higher than where their 'prey' might be, so they'll go as high as they want/can get. Obviously, if you don't want the cat on the back of the sofa or on the desk you can use my previous example to work with it to break the habit. But if you don't care, don't worry, it's just nature doing it's thing.