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How animals sleep
~t5 Most animals sleep in cycles of non-REM and REM sleep. But not all animals
I sleep the same number of hours. What is important for animals is how safe
I e they are when they are asleep, If an animal is in danger (for example, if other
animals hunt it to eat) then it will sleep fewer hours.
o Read the texts below and match them to the correct photo. Write the correct letter
in each photo.
a leopards often sleep in trees. There they are safe from lions.
b Bats sleep for nearly 20 hours a day. Nearly four hours is REM sleep.
c Giraffes sleep about 4.5 hours a day. They have about 30 minutes of REM sleep a night
d l ions sleep about 13.5 hours a day. They only get up to drink. They hunt during the night
e Dolphins sleep for 10 hours a day. but only half of their brain is asleep. About 15 minutes
is REM sleep
Mini-project
o Keep a sleep diary for a week. Make a note of:
• what time you go to bed • how many times you wake up during the night
• what time you wake up • if you sleep during the day (a siesta)
• if you dream • how many hours you sleep a day in total
o After a week, compare your sleep diaries in class.
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