The science of sleep

21. Giraffes require less sleep than dogs.
22. After four sleepless days, Randy had a delusion about him being a football celebrity.


Questions 23–27
Choose the correct letter, A, B, C or D.
Write the correct letter in boxes 23–27 on your answer sheet.
23. During the Light Sleep stage:

1. 
   Muscle activity increases
   
2. 
   Jiggling might occur  
   
3. 
   It is not easy to be woken up
   
4. 
   After waking up, one may experience slight disorientation
   

24. Heart rate is at the lowest level during:

1. 
   Light Sleep stage
   
2. 
   Rem Sleep
   
3. 
   True Sleep stage
   
4. 
   Third Sleep stage
   

25. The brain activity is really high:

1. 
   During REM sleep
   
2. 
   During the stage of True Sleep
   
3. 
   When we are awake
   
4. 
   During the Deep sleep stage
   

26. Humans require at least:

1. 
   7.75 hours of sleep
   
2. 
   5 hours of sleep
   
3. 
   8 hours
   
4. 
   There is no set amount of time
   

27. Pythons need:

1. 
   Less sleep than tigers
   
2. 
   Twice as much sleep as cats
   
3. 
   Almost ten times more sleep than giraffes
   
4. 
   More sleep than any other animal in the world
   

Questions 28–30
Complete the sentences below.
Write NO MORE THAN THREE WORDS from the passage for each answer.
Write your answers in boxes 28–30 on your answer sheet.
28. If we continually lack sleep, the specific part of our brain that controls language, is  .
29. True Sleep lasts approximately  .
30. Although during REM sleep our breathing rate and blood pressure rise, our bodies 
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