Sleep Disorders

Sleep is the state of natural rest. It is characterized by a reduction in voluntary body movement, decreased reaction to external stimuli, an increased rate of anabolism and a decreased rate of catabolism. Studies of human sleep have established five well-defined stages, according to EEG recordings and polysomnography - 75-80% is Non REM sleep (has 4 stages) and REM sleep. A sleep disorder is a disorder in the sleep patterns of a person. There are over 70 types of sleep disorders, commonest being

  • lack of sleep (eg, insomnia)
  • disturbed sleep (e.g., obstructive sleep apnea), and
  • excessive sleep (e.g., narcolepsy).


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