It is considered that there are four types of general sleeping disorders;

• Sleep disorder related to another mental disorder. These are related to a mental state or worry, eg :depression or anxiety.
  
  
• Sleep disorders due to a medical condition. These are related to some physical condition, eg: viral and bacteria infections, illnesses and diseases etc.
  
  
• Substance induced sleep disorders. These are related to the taking of some drugs, eg: prescription medication, caffeine, alcohol etc.
  
  
• Primary sleep disorders. These include dyssomnias and parasomnias like;
  - Insomnia (difficulty in initiating or maintaining sleep),
  - Hypersomia (people who are chronically sleepy),
  - Narcolepsy (irresistible attacks of sleep for about 10mins to 1 hour)
  - Sleep Apnea (breathing sleeping disorder which involves repeated episodes of upper airway obstruction during sleep). Obstructive Sleep Apnea can cause a lack of oxygen being transported to the brains. Patients are at risk of brain damage or even death.
  
  
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