By Rebecca Lewis @RebeccaSLewis

A DOLPHIN leaps into the air as it make its way across the Indian Ocean

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Time for a nap: A dolphin keeps its eyes closed as it swims

The graceful creatures were spotted off the coast of South Africa as the large pod hunted for food.

Intuition: A dolphin keeps part of its brain awake as it 'naps' to keep swimming and breathing

Rainier Schimpf, a photographer from South Africa, took pictures as he followed the pod’s journey across the ocean.

The dolphins can be spotted swimming underwater...
...And give a stunning glimpse into life under the sea

As the dolphins churned the water and surfaced to breathe, one enthusiastic member of their group leapt into the air.

Putting on a spectacular show for its human spectators, the stunning creature jumped several feet into the sky.

Moving fast: The speed of the dolphins churns up the surface of the water

The pictures, taken on June 22, show what Rainier believes to be dolphins sleeping with both eyes closed – an unknown occurrence.

Big jump: A dolphin shows off as it leaps into the air

The stunning mammals do not sleep in the same way humans do, instead one hemisphere of the brain will shut down and one eye will close while the other part remains active.

Sleeping beauties: The dolphins rest their eyes as they follow their pod

This allows the dolphins to surface above the water to breathe and to remain with their pod.

On the hunt: Rainier followed the pod of dolphins for months in the South African waters

But these pictures show dolphins with both eyes closed and apparently fast asleep.

Rainier said: "We were able to follow the dolphins in the last few months.

The dolphins took turns to sleep with the others led the pod

“We followed certain groups over 120km along the South Africa coastline on one day.

“When the dolphins did not hunt, many of them had their eyes closed – on both sides.

“This was completely new to us and could contradict our understanding of dolphins’ behaviour."