Nothing good will happen if your lenses is not designed for extended wear, be sure. If it is, there is still an increased risk of infection, abrasion, corneal ulcer, and corneal clouding, events that can lead to loss of vision. That said, modern extended wear contacts have been tested for a month of continuous wear. You balance the risk/reward,
Dr. Lior Koppel
Please be safe and always remember to take your contact lenses out prior to going to sleep!
Also giant papillae under the lids
You can also develop corneal abrasions , ulcers