The Ultradian Rhythm
It is a biological cycle that lasts less than a day and happens in alternating periods of high and low frequencies of brain activity. Some researchers argue that it involves the balance of sodium/potassium in our system.
The brain works harder than any other organ and when we work harder than the usual what and tends to happen is that there will be a disruption to the balance of sodium/potassium and makes your brain call for a break. We also lose the ability to focus and concentrate when tired.
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