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
bat
Yes
toads
By closing your eyes.
well there is no sea creature with 3 eyes they all have only 2
100 eyes
by blinking and sleeping, basically closing your eyes
that would be Kim Jonghyun
It sleeps with eyes open. Buterflies do not need eyelids.
The mighty Mississippi riter of course.
Yes you do!