Remove them as soon as you wake up or upon realizing your mistake. The lens may get stuck on the surface of the eye. If the lens does not come off quickly, do not force it out. Instead, blink and lubricate your eye using a sterile contact solution. The lubrication will cause the eye's surface to regain moisture, making it easier to remove the lens. It is dangerous to sleep in your contacts overnight due to the increased risk of infection. It is advisable not to wear the lens for one day after that, to enable your eye to recover.