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ayother ayother
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6 years ago
Each cycle of sleep during a typical night tends to be about
 
  A) 5 minutes long.
  B) 20 minutes long.
  C) 35 minutes long.
  D) 90 minutes long.
  E) 140 minutes long.
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haleyhaley
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6 years ago
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ayother Author
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6 years ago
Thanks
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Yesterday
You make an excellent tutor!
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2 hours ago
Thanks
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