May
Wearing your contact lenses while sleeping is very unhealthy for your eyes for several reasons. First, a portion of the oxygen supply that keeps your corneas healthy comes from your tear film and the air you are exposed to while your eyes are open when you’re awake. When you sleep, while wearing contact lenses, the oxygen level drops to very low levels since your eyelids are shut and any oxygen that gets past your eyelids is further blocked by the contact lenses. Oxygen deprivation might also result in pannus or abnormal blood vessel ingrowth at the edges of your corneas. Second, sleeping in your contact lenses greatly increases your risk for corneal infections (ulcers) that can cause permanent scarring of your cornea with vision loss.
Answer:
With some, you can. It depends on the type of lens you're wearing, the composition of your tear film, your general eye health, and other factors
Answer:
It can dry up and get sticky on your eye ball and cause eye infections and all sort of bad stuff!
Answer:
i do it all the time