Sleep and Wake Cycles

What was the purpose of Siffre's experiment?

• To analyze the effects of diet on sleep quality

• To investigate the influence of endogenous factors and zeitgebers on the sleep-wake cycle

• To determine the impact of technology on sleep-wake cycles

• To study the effects of natural light on sleep patterns

How long did Siffre spend in the dimly lit cave for his experiment?

• 6 months

• 3 months

• 1 month

• 2 months

What was the duration of Siffre's sleep-wake cycle at the end of the experiment?

• 24 hours

• 26 hours

• 25 hours

• 23 hours

What was the only form of contact with the outside world that Siffre had during the experiment?

• Email communication

• Letters

• Phone calls

• Video conferencing

What was the absence in the cave that affected Siffre's sleep pattern?

• Natural light

• Food

• Clock

• Technology

What is the definition of a biological rhythm? 

• When you play the drums on your friends belly
• Distinct patterns of changes in body activity that conform to cyclical time periods
• The sleep/wake cycle
• An internal response to a change in your environment 

Siffre's study was conducted in what kind of environment?

• Skip
• Under the Sea
• Classroom 
• Cave

The sleep wake cycle is an example of?

• Circadian Rhythm
• Exogenous Zeitgeber
• Ultradian Rhythm 
• Infradian Rhythm 

Which of these is an example of individual differences in circadian rhythms? 

• Age differences in sleep/wake patterns 
• People in these studies may not be representative of wider society

Siffre found that the average circadian rhythm is how many hours long?

• 24-25
• 29
• 22
• 13