Contacts, to wear/not to wear.?

I wear my contacts every hour, every day, and while I sleep. I'm told I'm not supposed to, and they are two week disposables that I usually wear for two months before I toss them out. A few years ago, I used to wake up with irritated eyes, slightly dry, but that was when I would forget to take them out for just one night. I've worn contacts, different brands for about 8 years now, and It does not bother me a bit. I even had my eyes checked before I bought another few boxes. I kinda fibbed and told them I hadn't worn my contacts for a few months. I went in with my gles on. I had my eyes checked and they said my eyes were in great shape. I'm wondering If anyone knows of any long term problems that could come up by doing this? They don't bother me ever, I wear them constantly, and nothing has changed so far. Although I keep being told I should be taking them out at night. What gives?