in fact, body factor will include pain, and some sypmtoms of other illness.

like:

• Night time angina (chest pain) from heart disease
• Acid reflux disease (GERD)
• Chronic obstructive pulmonary disease (COPD)
• Nocturnal asthma (asthma with night time breathing symptoms)
• Obstructive sleep apnea
• Chronic pain syndromes
• Chronic fatigue syndrome
• Congestive heart failure
• Degenerative diseases, such as Parkinson’s disease and Alzheimer’s disease (Often insomnia is the deciding factor for nursing home placement.)
• Brain tumors, strokes, or trauma to the brain

above are high risk group of insomnia, and usually result in Chronic insomnia insomnia

• anxiety
• stress
• schizophrenia
• mania (bipolar disorder)
• depression

usually thus factors are caused by Stressful situations in life, like exam preparation, loss of a loved one, unemployment, divorce, or separation etc.

if the stressfull situation is not gone, the insomnia sypmtons may last long time, finally result in Acute insomnia or Chronic insomnia.

• Uncomfortable room temperature (too cold or too hot)
• Jet lag
• Changes in shift work
• Insomnia related to high altitude (mountains)
• Excessive or unpleasant noise
• Stressful situations in life (such as exam preparation, loss of a loved one, unemployment, divorce, or separation)

External Environmental Factors usually result in Transient Insomnia. once the environmental Factors is removed, insomnia is gone.

http://www.cure-insomnia.org/insomnia-cause/insomnia-cause-external-environmental-factors/

2. Psychological and spiritual Factors

http://www.cure-insomnia.org/insomnia-cause/insomnia-cause-psychological-and-spiritual-factors/

3. Body factors

http://www.cure-insomnia.org/insomnia-cause/insomnia-cause-body-factors/

4. Special groups

http://www.cure-insomnia.org/insomnia-case/insomnia-cause-high-risk-groups/

5. Drug factors

coming soon

6. A number of other aspects

coming soon