TED: Our natural sleep cycle is nothing like what we do now | Jessa Gamble

The video discusses the evolution of internal clocks in living beings, highlighting examples like the horseshoe crab. It explains the human body clock's significance and its cultural impact, especially in regions with extreme daylight variations. The video also explores natural sleep patterns without artificial light and the challenges posed by modern lifestyles, such as jet lag and shift work.

What example is used to illustrate the concept of internal clocks in animals?

• A hibernating bear

• A horseshoe crab

• A migrating bird

• A nocturnal owl

How do humans demonstrate the presence of an internal body clock?

• By adjusting to new time zones instantly

• By sleeping for exactly 8 hours every night

• By maintaining a consistent sleep schedule

• By waking up slightly later each day in isolation

What cultural impact does the body clock have in regions with extreme daylight variations?

• It causes people to sleep less in winter

• It leads to uniform activity levels throughout the year

• It eliminates the need for artificial lighting

• It results in highly seasonal cultural practices

What is a characteristic of natural sleeping patterns without artificial light?

• Sleeping continuously for 8 hours

• Sleeping twice every night with a meditative period in between

• Sleeping in short naps throughout the day

• Sleeping only during the day

What modern lifestyle factor is mentioned as disrupting natural sleep rhythms?

• Regular exercise

• Jet lag and shift work

• Balanced diet

• Consistent bedtime