This was one of the most interesting facts that I learned recently.
Dolphins needs to come up to the surface to get air to breathe.
But how do they do this when they sleep?
The answer is that only part of their brain sleeps at a time, so that they can continue to rise to the surface for air 24/7.
Part of their brain sleeps while the other part stays awake.
I think that this truly happens with people too.
If you have ever been overtired, your brain still needs to sleep.
At some point, you can literally feel part of your brain go to sleep even as the rest is awake to do what it needs to do (even at suboptimal functioning).
This is beyond fascinating how G-d created us to adapt and survive. 😉
(Credit Photo: Andy Blumenthal)