Extended wear contact lenses are lenses that you can sleep in, for up to 30 nights at a time. Extended wear offers lifestyle benefits and the convenience of not having to remember to take to contacts out before sleeping. High oxygen silicon hydrogel lenses are used for extended wear, allowing for greater flow of oxygen to the eye. Not all contact lenses are suitable for extended wear and extended wear is not suitable for all people. Extended wear carries a greater risk of infection and other complications compared to wearing contacts on a daily wear basis, so it is important that professional advice from an optometrist is provided and regular checks with your optometrist are conducted to monitor eye health.