Sleep isn’t as simple as “rest” for you brain. Your body does “rest” all the cells are metabolize all the time. What goes on in your brain is more like the night times at a bit office. The major executives and engineers and analysis are are gone, but the building is still Active. The night janitors coming in to clean up an office, the interns staying late to finish filing, the IT guys updating the servers, security guard doing this rounds, etc. It’s not resting, it’s doing the stuff that your brain wasn’t doing when you were awake.
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