Wearing contacts for napping is usually not recommended because contacts are a special type of contact lens that require contact with the cornea, so they can easily lead to corneal hypoxia. The contacts themselves are pigmented, and the oxygen and water permeability of the pigmented area is even lower, making contacts less oxygen and water permeable than other soft contact lenses. If you wear contacts to take a nap, there is a greater risk of corneal dryness and hypoxia, which can cause corneal epithelial damage. Because you don’t blink when you sleep, there is no tear exchange, which can aggravate one of the symptoms of dry eyes. Therefore, wearing contacts for naps is not recommended and can easily cause damage to the cornea.