I found it very easy to sleep with my piggies in my room. The first night I had them there I burst out laughing and had the gigglefits as I could hear them chewing and it amused me -crazy I know.
It was then easy for a week until one of them found a plastic tube and started playing with it slamming it against the cage bars for about half an hour.
But that was when they were new to the cage and I'd only owned them for a week or so.
Ever since they are quite quiet, you get used to the normal noises like chewing, rumbling etc.