Circadian Rhythms-- It's a fancy name for our body's internal clock. And like it not, they dictate so much of what we do and how we feel. Anthony looks at why we have them and how they work.

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Scientists map the wiring of the biological clock
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"The connections make the clock precise but also let it adjust to changes in day/night cycles."

Night Work May Impair Glucose Tolerance
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"A new study suggests that night work may impair glucose tolerance, supporting a causal role of night work in the increased risk of Type 2 diabetes among shift workers."

Study links workplace daylight exposure to sleep, activity and quality of life
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"Enhancing indoor lighting may improve office workers' physical well-being and sleep quality."

Delayed sleep phase disorder
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"Delayed sleep-phase disorder (DSPD), also known as delayed sleep-phase syndrome (DSPS) or delayed sleep-phase type (DSPT), is a circadian rhythm sleep disorder affecting the timing of sleep, peak period of alertness, the core body temperature rhythm, hormonal and other daily rhythms, compared to the general population and relative to societal requirements."

Circadian Rhythms Fact Sheet
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"Circadian rhythms are physical, mental and behavioral changes that follow a roughly 24-hour cycle, responding primarily to light and darkness in an organism's environment."

Inside Life Science: How Our Bodies Keep Time
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"Even when we're not at work, we're on the clock — our biological clock, that is."

Watch More:
History of Daylight Saving Time:
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How Long Should We Sleep?:
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Sand Hates You:
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