Instructions

View the Show Me More video and then answer the questions.

Icon

Iconica/Getty Images

View the video (Opens in new window)

Question 1

According to the video that you watched, one of the most important human inventions is blank.

Question 2

Which part of the brain contains our “internal clock?”

Question 3

In order to assess her internal click, Clarissa goes to a sleep laboratory where she will be monitored for a 24-hour period. Every hour, she gives a saliva sample, which is then tested for its blank levels.