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12366 12366
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6 years ago
Sleep is initiated in Stage 1, proceeds through Stages 2, 3, and 4, then returns to:
 
  a. Stage 1
  b. Stage 3
  c. It stays in Stage 4 until the sleeper wakes.
  d. None of the above
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tommy7234324tommy7234324
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12366 Author
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6 years ago
Thanks
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You make an excellent tutor!
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this is exactly what I needed
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