Sleeping with contact lenses may cause eye injuries, mainly corneal hypoxia, corneal epithelial damage and corneal infection. 1. Corneal hypoxia, epithelial damage: contact lenses worn for too long, corneal hypoxia, easily lead to epithelial cell damage, which leads to a variety of eye discomfort, affecting vision. 2. Corneal infection: long time wearing contact lenses, corneal infection may occur. Lipids and proteins are deposited on the inner surface of the eyeglasses, which can easily harbor bacteria and may cause bacterial keratitis and corneal ulcers, resulting in symptoms such as foreign body sensation, pain, photophobia and tearing, and vision loss. Wearing contact lenses for a long period of time may also lead to a shortening of the service life of the glasses. Therefore, it is not recommended to wear contact lenses to bed. It is best to wear contact lenses for no more than 8 hours a day, and you should do a good job of cleaning and caring for them every day to reduce the risk of infection.