Chronobiology Introduction (02:16)
Professor Till Roenneberg explains how biological clocks signal living processes. The Industrial Revolution disrupted our internal time systems.
Chronobiology Implications (01:17)
Understanding our biological clock can improve our health. Roenneberg explains why most people begin their day too early.
Adolescent Time Zone (01:58)
Most teenagers have difficulty waking up. Roenneberg's sleep experiment shows their biological clock shifts to later in the day—suggesting schools should start later.
Chronobiology DNA (01:11)
Research shows that some adults are genetically programmed to wake up later than others.
Central Biological Clock (00:50)
Learn how brain nerve cells synchronize interior and exterior time by responding to daylight. Genes determine early and late risers.
Intelligent Medication (03:10)
Learn how researchers developed a rheumatoid arthritis treatment using biological rhythms to suppress inflammatory messengers.
Cancer Chronotherapy (05:12)
French researchers administer chemotherapy to patients according to biological rhythms—minimizing damage to healthy cells and decreasing side effects.
Determining Chronotype (03:15)
Achim Kramer uses glow worm enzymes to study when "clock" genes are active in cells. He hopes to develop a simple test to identify early and late risers.
Winter Depression (01:08)
Most people don't get enough sleep. Learn how daylight hours affect our biological clock that is still sensitive to the seasons.
Social Jetlag (02:50)
Roenneberg explains how biological, sun, and social clocks interact. Learn how modern time zones create a discrepancy between internal and external time.
Electronics and Sleep (02:13)
Blue light signals the brain to synchronize to the sun's position. Learn how computer screens disrupt melatonin and contribute to attention deficit disorder among children.
Chronobiology and School Performance (03:44)
Focusing in the early morning is a challenge for most teenagers. A classroom is fitted with blue light to test whether it increases alertness by mimicking daytime.
Young Adult Biological Clock (01:10)
Roenneberg believes that teenagers turn into night owls because they've had to engage in nocturnal activities for most of human history.
Chronobiology and Dementia (04:08)
Researchers adjust nursing home lighting systems in an effort to treat nighttime anxiety and reestablish sleep patterns.
Sleep Deprivation Health Effects (01:02)
Dementia patients benefit from bright daylight and darkness at night. Studies suggest links between Alzheimer's disease and insufficient rest.
Chronobiology and Diabetes (03:52)
Learn how melatonin inhibits insulin release, causing Type II diabetes. Overeating and sleep deprivation cause pancreatic overproduction.
Sleep and Health (01:29)
Despite modern attitudes, sleep is important for body function. Night shift workers have higher risks of illness.
Slowing Daily Life (02:01)
A Benedictine nun discusses how to eliminate modern distractions and focus on what's important.
Chronobiology Society (00:47)
Roenneberg argues that allowing people to live according to their biological clock would reduce healthcare costs and improve productivity.
Chronotherapy Program (01:31)
A French colon cancer patient treated according to his biological clock experiences reduced side effects from chemotherapy.
Chronotherapy Success (04:45)
A colon cancer survivor shares how illness has changed her perspective. Treatment according to the biological clock protects healthy cells while targeting malignancies.
Chronobiology Education Results (01:56)
Students make 30% fewer mistakes on standardized testing under daylight lamps. Roenneberg advocates projecting the sky into classrooms and offices.
Credits: Chronobiology: How Our Body Clock Works (00:30)
Credits: Chronobiology: How Our Body Clock Works
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