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Sleep, Sleep Disorders, and Biological Rhythms
Lesson 3 Organizer: Web Version
Activity 1: Michel Siffre Story
What the Teacher Does
Procedure Reference
Remind the class of their responses to two of the statements
about sleep from Lesson 1:
• Everyone has a biological clock. (True.)
• The body adjusts quickly to different sleep schedules.
(False.)
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Step 1
Give each student a copy of Master 3.1, Michel Siffre Story,
and instruct them to read it.
• Ask students to explain why his “day” varied so much.
• Ask students how they know when it is time to sleep.
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Steps 2–4
Give each student a copy of the top half of Master 3.2, The
Rhythms of Sleep, and instruct them to read it.
• Ask the students whether this information helps them
understand why Siffre’s day grew longer than 24 hours.
• Ask why our own biological clocks don’t cause our
days to grow longer.
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Steps 5–7
Have the class read the bottom half of Master 3.2, The
Rhythms of Sleep.
• Ask students what happened to Siffre’s sleep cycle
after leaving the cave.
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Steps 8 and 9
= Involves copying a master.
= Involves using the Internet.
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