Well, it is ok to wear your circle contact lenses for about 8 hours everyday. If you do that, it will be fine. But on the other hand, if you wear them when you go to sleep, it will be harm to your eyes, for your eyes need to breathe and circle lenses are usually on the thicker side. Or it will lead to eye infection and many other eye diseases, such as the pink eyes, dry eyes. Also, you should not wear contact lenses, when you have shower. In that way, it can let some water get into your contacts, and some bacteria invade into your eyes. Anyway, it can be bad for your eyes. so just avoid it.