Common in students, ________ is an accumulated amount of ...

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Common in students, ________ is an accumulated amount of sleep-loss prompted by short sleep cycles.
 
  A) sleep surplus
  B) sleep deprivation
  C) sleep debt
  D) long sleep

Question 2

The five stages of sleep are differentiated from each other by
 
  A) varying levels of adrenaline found in the blood.
  B) varying patterns of electrical activity generated by the cerebral cortex.
  C) the five different patterns of eye movement.
  D) All of the answers are correct.

[xthemafja]

Answer to Question 1

Answer: C

Answer to Question 2

Answer: B