Snakes appear to have both eyes open as they don't have any eyelids
Troglobites See the link below for specific animals: http://www.scienceray.com/Biology/Zoology/Animals-with-No-Eyes-Cave-Adaptation.282259
Yes
bat
toads
By closing your eyes.
well there is no sea creature with 3 eyes they all have only 2
100 eyes
It sleeps with eyes open. Buterflies do not need eyelids.
The mighty Mississippi riter of course.
that would be Kim Jonghyun
by blinking and sleeping, basically closing your eyes
Some do. I used to have a chinchilla that slept with his eyes open but my other one sleeps with his eyes open.