Did anyone ever say you seem half-asleep? Maybe you have a dolphin brain!

"Their sleep, of which there is only NREM (non-REM), can be unihemispheric, meaning they will sleep with half a brain at a time! 


Photo from NASA
One half of the brain must always stay awake to maintain life-necessary movement in the aquatic environment. 

But the other half of the brain will, at times, fall into the most beautiful NREM sleep. 

Deep, powerful, rhythmic, and slow brainwaves will drench the entirety of one cerebral hemisphere, yet the other half of the cerebrum will be bristling with fre­netic, fast brainwave activity, fully awake." 



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