Jornal de Distúrbios do Sono e Terapia
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Chronotypes and their variations

Philip Polson

The inherent predisposition of your body to sleep at a specific hour, or what most people refer to as being an early bird vs a night owl, is known as chronotype. Chronotype affects appetite, exercise, and core body temperature in addition to regulating sleep and wake periods. It is the cause of your feeling more alert at certain times of the day and sleepier at others.