Do Fish Dream?

TL;DR

Fish do not have REM eye movements like humans, but research suggests that they experience sleep patterns similar to our dream-filled REM sleep.

Transcript

[♩INTRO] It’s easy to look at a sleeping dog, legs twitching as she snoozes, and imagine she’s dreaming of chasing rabbits. And it’s only natural for us humans to wonder if other animals dream. But dogs’ brains are relatively similar to ours. What about something way more different from us? Say, a fish? We don’t yet know exactly why our brains race... Read More

Key Insights

• 🧠 Dogs' brains, which are similar to humans, suggest that they can dream.
• 😪 Human sleep occurs in cycles, with REM sleep being associated with dreams.
• 😪 Fish sleep patterns have been studied since 1913, and in 2019, researchers observed sleep patterns resembling REM sleep in zebrafish.
• 😃 Fish do not have REM eye movements but have similar sleep states to humans.
• 🤙 The study used zebrafish, which have a similar brain region to humans called the dorsal pallium.
• 🐟 Fish sleep patterns may have evolved millions of years ago, before fish and humans diverged.
• 🤗 The study did not prove that fish can dream, but it opens up the possibility.

Questions & Answers

Q: Do fish have REM eye movements like humans during sleep?

No, fish do not have REM eye movements like humans; their eyes remain still during sleep.

Q: Do fish show similar sleep patterns to humans?

Yes, fish have been observed to cycle through sleep patterns, including slow bursting sleep and propagating wave sleep, which resemble our own sleep phases.

Q: Can we see inside the brains of fish while they sleep?

Yes, scientists have used a gene that makes the neurons of zebrafish glow when active, allowing them to observe brain activity during sleep.

Q: Does the study indicate that fish can dream?

The study does not prove that fish can dream, but it suggests that they go through sleep patterns similar to our dream-filled REM sleep, making fish dreams a possibility.

Summary & Key Takeaways

• Dogs have similar brain patterns to humans and are believed to dream.

• Humans experience dreams during the rapid eye movement (REM) phase of sleep.

• A 2019 study on zebrafish revealed that they go through sleep patterns that resemble our dream-filled REM sleep.