Why do my contact lenses get dried out at night?

Question

It seems like whenever I get really tired or it's night time, my contacts get so dried out and blurry. It makes my eyes so irritated. I was just wondering what may cause this. I wear contact lenses 17 hours a day.

Answer 1

because your eyes are closed and you are not blinking frequently, which passes more fresh eye juice over your eyeballs....

Answer 2

Contact lenses will get dry when it stays too long. Just put some re-wetting drops on and that'll be fine. Your eyes will, hopefully, not be dry afterwards.  

Answer 3

The longer you wear contact lenses the dryer they will become since they have been out of solution for a long time. You can buy eye drops specifically for this purpose!