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Sleep: On the Nature of Larks & Owls in Their Modern Habitat

Sleep: On the Nature of Larks & Owls in Their Modern Habitat

Have you ever wondered why some people hit the gym at 6:00am and others tell you they never go to sleep before midnight and prefer to sleep in until 10:00am or 11:00am?  

Why is it that some people love mornings, while others hate getting up?

Which one is better for your body, anyway?