What is sleep? Sleep is a state of behavioral quiescence with reduced sensory responsiveness. From the simple cnidarian, jelly-fish to human beings, sleep has been found to be a conserved behavior in the metazoan world ...

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Abstract not available

For centuries, it has been observed that behavioral and physiological processes of most organisms occur in a rhythmic manner with different periodicities (see Daan, 2010). Trees flower and fruit at species-specific seasons ...