---
title: "Do fish sleep with their eyes open?"  
description: "A brief explanation about whether fish sleep with their eyes open"  
author: "Anjita D."  
published: 2023-12-15  
canonical: https://yourviews.mindstick.com/story/3523/do-fish-sleep-with-their-eyes-open  
category: "animals"  
tags: ["fish sleep", "eyes open", "animals", "facts", "general knowledge"]  
reading_time: 1 minute  

---

# Do fish sleep with their eyes open?

![Do fish sleep with their eyes open](https://yourviews.mindstick.com/stories/356d4763-60fa-49db-91ff-77daa38a158f/images/2247854b-d220-4727-8772-ee15de2f4ab2.jpeg) ![Do fish sleep with their eyes open](https://yourviews.mindstick.com/stories/356d4763-60fa-49db-91ff-77daa38a158f/images/eb3c045b-d237-4f56-b8aa-448b94216b6e.jpeg) Yes, fish do sleep with their eyes open because they lack eyelids; they cannot close their eyes as we do. ![Do fish sleep with their eyes open](https://yourviews.mindstick.com/stories/356d4763-60fa-49db-91ff-77daa38a158f/images/07156158-4219-4fe1-9f95-2b6cb6cb81cb.jpeg) Fish have periods of rest typified by reduced activity and response to their surroundings, similar to but separate from human sleep. ![Do fish sleep with their eyes open](https://yourviews.mindstick.com/stories/356d4763-60fa-49db-91ff-77daa38a158f/images/cab9c120-2074-4c0f-bade-2812b5af10f4.jpeg) During rest, fish may keep their eyes open but reduce their pupils or retain a fixed focus, causing their movements and breathing rate to slow. ![Do fish sleep with their eyes open](https://yourviews.mindstick.com/stories/356d4763-60fa-49db-91ff-77daa38a158f/images/60cd4d25-2a55-4b10-990b-61b85642177e.jpeg) Sharks and dolphins use unihemispheric sleep, which allows one brain to sleep while the other remains alert, similar to a night watchman on duty. ![Do fish sleep with their eyes open](https://yourviews.mindstick.com/stories/356d4763-60fa-49db-91ff-77daa38a158f/images/360afad6-b245-4374-8324-5bf657c10f77.jpeg) Fish require sleep for brain health, physical recovery, and predator evasion, as it aids in information processing, tissue repair, and energy refill.

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Original Source: https://yourviews.mindstick.com/story/3523/do-fish-sleep-with-their-eyes-open

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