I take them out every night. I use one pair for two or three weeks at a time before I use a new pair.
One time I kept them in overnight, and ended up in the hospital the next morning with a severe eye infection. It was incredibly painful, and I had to wear sunglasses indoors for a few days because light made the pain worse. After a few weeks of taking steroid eye drops and wearing glasses, I was able to go back to contacts, only because I hate wearing glasses. It was awful and I'm never doing it again.
One time I kept them in overnight, and ended up in the hospital the next morning with a severe eye infection. It was incredibly painful, and I had to wear sunglasses indoors for a few days because light made the pain worse. After a few weeks of taking steroid eye drops and wearing glasses, I was able to go back to contacts, only because I hate wearing glasses. It was awful and I'm never doing it again.