no
Dolphins are reputed to be able to shut down one side of their brain and sleep. On wakening, they will shut down the other half. (They still have to breath air.) So, one eye open at a time is probably correct.
No.
Yes they sleep with their eyes open :)
No. Kookaburras are not known to sleep with their eyes open.
No. They close their eyes like us when they sleep.
yes
yes they sleep, but there eyes are open
No, they close their eyes.
Some people can sleep with their eyes open. Many 'sleepwalkers' give the appearance that they're fully awake - including having their eyes open.
Floating turtles tend to sleep with their eyes open. This ability to sleep with their eyes open helps them to stay alert and detect potential threats in their environment even while they are resting.
open
no