Is it bad for your eyes to sleep with soft contact lenses? and to only take it out every 2 nd day?

Contact lenses.: Several extended wear lenses are FDA-approved for up to seven days of continuous wear, and at least two brands of silicone hydrogel EW lenses — Air Optix Night & Day (Alcon) and PureVision (Bausch + Lomb) — are approved for up to 30 days of continuous wear.During your contact lens fitting and follow-up, your optometrist or ophthalmologist will advise you whether you can wear EW contacts overnight and how many days of continuous wear your eyes can tolerate.