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, using the horseshoe crab as an example. It explains how humans also have a body clock that influences behavior and culture. The video explores cultural adaptations to varying light conditions and describes natural sleep patterns without artificial light. It concludes by highlighting modern challenges to these natural rhythms, such as jet lag and shift work.

What is the primary function of internal clocks in living organisms?

• To predict weather changes

• To adapt to light and darkness

• To communicate with other species

• To enhance physical strength

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

• By eating at irregular intervals

• By adjusting to time changes without external cues

• By maintaining a consistent wake-up time

• By sleeping at random times

What cultural behavior is influenced by the body clock in Arctic regions?

• Seasonal variations in activity levels

• Constant indoor activities

• Consistent work hours throughout the year

• Uniform sleeping patterns

What is a characteristic of natural human sleep patterns without artificial light?

• Sleeping only during the night

• Sleeping only during the day

• Sleeping continuously for 8 hours

• Sleeping twice with a period of wakefulness in between

What is a potential downside of modern lifestyles on our natural rhythms?

• Improved social interactions

• Disruption of natural sleep patterns

• Enhanced mental clarity

• Increased physical activity