• aching musclesFact: date=July 2008
• blurred visionFact: date=July 2008
• clinical depressionFact: date=July 2008
• colorblindnessFact: date=July 2008
• daytime drowsiness and naps, excessive daytime sleepiness (EDS)Fact: date=July 2008
• loss of apetite
• decreased mental activity and concentration

• depersonalization/derealizationFact: date=July 2008
• weakened immune systemFact: date=July 2008
• dizzinessFact: date=July 2008
• dark circles under the eyesFact: date=July 2008
• faintingFact: date=July 2008
• general confusionFact: date=July 2008
• hallucinations (visual and auditory)Fact: date=July 2008
• hand tremorsFact: date=July 2008
• headacheFact: date=July 2008
• hyperactivityFact: date=July 2008
• hypertensionFact: date=July 2008
• impatienceFact: date=July 2008
• irritability
• lucid dreaming (once sleep resumes)Fact: date=July 2008
• memory lapses or loss
• nauseaFact: date=July 2008
• nystagmus (rapid involuntary rhythmic eye movement)Fact: date=July 2008
• psychosis-like symptomsFact: date=July 2008
• sleep paralysis (while awake)
• pallorFact: date=July 2008
• constipation
• slowed reaction timeFact: date=July 2008
• slurred and/or nonsensical speechFact: date=July 2008
• sore throatFact: date=July 2008
• stuffy noseFact: date=July 2008
• weight loss or gainFact: date=July 2008
• severe yawning
• decreased desire for sexual activityFact: date=July 2008
• deliriumFact: date=July 2008
• temper tantrums in children
• symptoms similar to:
• Attention-deficit Hyperactivity Disorder
• alcoholic intoxicationFact: date=July 2008

Diabetes

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.

Effects on the brain

Sleep deprivation can adversely affect brain function. A 2000 study, by the UCSD School of Medicine and the Veterans Affairs Healthcare System in San Diego, used functional magnetic resonance imaging technology to monitor activity in the brains of sleep-deprived subjects performing simple verbal learning tasks. The study showed that regions of the brain's prefrontal cortex displayed more activity in sleepier subjects. Depending on the task at hand, the brain would sometimes attempt to compensate for the adverse effects caused by lack of sleep. The temporal lobe, which is a brain region involved in language processing, was activated during verbal learning in rested subjects but not in sleep deprived subjects. The parietal lobe, not activated in rested subjects during the verbal exercise, was more active when the subjects were deprived of sleep. Although memory performance was less efficient with sleep deprivation, greater activity in the parietal region was associated with better memory.