Sleep deprivation

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Sleep deprivation is a general lack of the necessary amount of sleep. This may occur as a result of sleep disorders, active choice or deliberate inducement such as in interrogation or for torture

Physiological effects Generally, lack of sleep may result in:

  • aching muscles
  • blurred vision
  • clinical depression
  • colorblindness
  • daytime drowsiness and naps, excessive daytime sleepiness (EDS)
  • decreased mental activity and concentration
  • depersonalization/derealization
  • weakened immune system
  • dizziness
  • dark circles under the eyes
  • fainting
  • general confusion
  • hallucinations (visual and auditory)
  • hand tremors
  • headache
  • hyperactivity
  • hypertension
  • impatience
  • irritability
  • lucid dreaming (once sleep resumes)
  • memory lapses or loss
  • nausea
  • nystagmus (rapid involuntary rhythmic eye movement)
  • psychosis-like symptoms
  • pallor
  • slowed reaction time
  • slurred and/or nonsensical speech
  • weight loss or gain
  • severe yawning
  • increased desire for sexual activity
  • delerium
  • symptoms similar to:
  • Attention-deficit Hyperactivity Disorder
  • alcoholic intoxication


A 1996 study by the University of Chicago Medical Center showed that sleep deprivation severely affects the human body's ability to metabolize glucose, which can lead to early-stage Diabetes Type 2.


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