Multiple choice general knowledge

Dolphins sleep with one eye open

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dolphins sleep with one eye open due to unihemispheric slow-wave sleep - they shut down one half of their brain at a time while the other half remains awake. This adaptation allows them to maintain consciousness for breathing and predator detection. They alternate which brain hemisphere is awake, effectively keeping 'one eye open' for surveillance.

Keep practicing — related questions