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      <div>Cómo funciona el sueño</div>

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<p><span><span><span>El sueño es un período de descanso que se alterna con la vigilia. Todos tenemos relojes internos en el cuerpo que controlan los momentos en que estamos despiertos y cuándo el cuerpo está listo para dormir. Esos relojes tienen ciclos de aproximadamente 24 horas. Son muchos los factores que regulan los relojes, como la luz, la oscuridad y los horarios del sueño. Una vez que nos dormimos, atravesamos un ciclo por las etapas del sueño durante la noche siguiendo un patrón predecible.<br /><br />
El sueño es importante porque afecta muchos de los sistemas del cuerpo. No dormir lo suficiente o tener sueño de mala calidad aumenta el riesgo de problemas cardíacos y respiratorios y afecta el metabolismo y la capacidad de pensar con claridad y concentrarse en las tareas. </span></span></span></p>


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