Dolphins sleep with one eye open?

Keep practicing — related questions

• Who sleep with one eye open?
• Which animal does sleep with one eye open?
• Dolphins can swim and sleep at the same time.
• Dolphins can swim and sleep at the same time.
• which animal sleep with one eye open
• Which animal sleeps with one eye open?
• Which animal sleeps with one eye open?
• who is the founder of facebook?