Well, considering bettas probably have alot of other animals trying to kill it (including other bettas) in the wild. They, much like Rabbits, would sleep in a state which allows them to rest while being totally aware of their surroundings. If it had dreams then it would not be able to protect itself when sleeping and would make easy prey.
That is my opinion anyway.
I beleive they do. After reading something about dreams and why they happen they probably do. However the article said that they can't remember dreams. It said that dreams are about food and fears.
I'm not sure. It's pretty much proven when animals and humans go to REM sleep, they become essentially paralized, because if they weren't, they'd act out what they dream. I know humans and some animals dream scary things which apparently prepare them for living in the real world during rem sleep (remember when you used to have scary dreams of being chased by monsters as a little kid?)... hence why nature has created a way for your body to paralize itself during REM sleep.
Apparently some scientists did an experiment with rats, cats, dogs, etc, where they disabled the paralasis, and the cats, rats, and dogs would walk/run around while dreaming, much like they would awake (they were sleep walking). I'm thinking betta fish might, after all, there are times when you walk in on your betta, and he's sleeping, not moving, and doesn't react to you for a bit. What if that's their form of paralasis during REM sleep? Or they might be in that restful trance Aluyasha said.
Like many others I'm not sure what to believe when it comes to fish dreaming. My guess would be no due to the many reasons that've already been posted by others.
i think they may experience almost a day dream kind of thing while resting. but like what was said, they can't be completely out of it since they are always protecting their territory.
No - fish dont simply have the brainpower. A fish's mind is VERY simple and VERY small compaired to the human mind. Dreams require imagination. Our minds subconsciously create an environment (places, cities, etc) and objects so complex and thorough that we actually believe they are real when we are in our dream. I dont think a fish's mind is capable of that. Perhaps other mammalian animals can dream (primates for example), but not fish.
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