Do Any Animals Never Sleep?

I was coming home late tonight. And I noticed, as I often do, moths dancing around my porch light.

This got me to thinking, are there any animals that never sleep? And if so, how do they do it? Do scientists ever study the phenomenon?

Oh, and at this point, I feel compelled to bring up the unusual case of Paul Kern (insomniac) - Wikipedia

Thoughts?

 

I don't know any off the top of my head but it wouldn't surprise me if some invertebrate animals in the ocean don't sleep.

 

Dolphins don't sleep. giraffes, sheep, horses, bullfrogs (which aren't actually animals). With all them sharks in the ocean I doubt many fishes get much sleep either.

 

Most of them sleep, but not as much or in the same way as we do. Dolphins are nappers, and engage in unihemispheric sleep, resting half of their brains at a time. Giraffes in the wild sleep for short periods of time and also enter into a a pattern called paradoxical sleep in which they rest with rapid eye movement and reduced musclar activity. Sheep sleep lighty, in spurts, standing up or lying down, to be ready for predators. Horses , likewise--sleeping in short bursts of 15 minutes or so, with similar paradoxical sleep patterns to giraffes. It's true that frogs rest rather than sleep.(BTW, they are animals; otherwise they'd be minerals or vegetables).

 

Dolphins don’t sleep? I didn’t know that. I learned recently that honey nerds sleep - sometimes work themselves to sleep.

 

I am sure cats don't sleep much deeply. Grew up with them, still do I saw them dreaming and mewing in their sleep, but as soon as another creature is close, their fur starts to stands up a bit. They can doze off for 16 hours, for sure. But how much of that is a real sleep? Not much!