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Even in sleep, the brain moves in 90-minute cycles. Every 90 minutes, the brain goes from a state of deep concentration to a short period of energy loss. From light to deep sleep, that is, every 90 minutes, a complete cycle. Even heart rate, body temperature, secretion of hormones such as growth hormone, and even appetite fluctuate with this rhythm.
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Even in sleep, the brain moves in 90-minute cycles. Every 90 minutes, the brain goes from a state of deep concentration to a short period of energy loss. From light to deep sleep, that is, every 90 minutes, a complete cycle. Even heart rate, body temperature, secretion of hormones such as growth hormone, and even appetite fluctuate with this rhythm.