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Insomnia (cont.)

Insomnia Causes

Patient Comments

Insomnia may be caused by a host of different reasons. These causes may be divided into situational factors, medical or psychiatric conditions, or primary sleep problems.

Many of the causes of transient and short-term insomnia are similar and they include:

  • Jet lag
  • Changes in shift work
  • Excessive or unpleasant noise
  • Uncomfortable room temperature (too hot or too cold)
  • Stressful situations in life (exam preparation, loss of a loved one, unemployment, divorce, or separation)
  • Presence of an acute medical or surgical illness or hospitalization
  • Withdrawal from drug, alcohol, sedative, or stimulant medications
  • Insomnia related to high altitude (mountains)

Uncontrolled physical symptoms (pain, fever, breathing problems, nasal congestion, cough, diarrhea, etc.) can also cause someone to have insomnia. Controlling these symptoms and their underlying causes may lead to resolution of insomnia.

Causes of Chronic or Long-Term Insomnia

The majority of causes of chronic or long-term insomnia are usually linked to an underlying psychiatric or physiologic (medical) condition.

Psychological Causes of Insomnia

The most common psychological problems that may lead to insomnia include:

Insomnia may be an indicator of depression. Many people will have insomnia during the acute phases of a mental illness. As mentioned earlier, depression and anxiety are strongly associated with insomnia and are the most common causes of sleeplessness.

Physiological Causes of Insomnia

Physiological causes vary from circadian rhythm disorders (disturbance of the biological clock) and sleep-wake imbalance, to a variety of medical conditions. The following are the most common medical conditions that trigger insomnia:

High Risk Groups for Insomnia

In addition to people with the above medical conditions, certain groups may be at higher risk for developing insomnia:

  • Travelers
  • Shift workers with frequent changing of shifts
  • Seniors
  • Adolescents or young adult students
  • Pregnant women
  • Women in menopause
  • People who abuse drugs
  • Alcoholics

Medication Related Insomnia

Certain medications have also been associated with insomnia. Among them are:

  • Certain over-the-counter cold and asthma preparations.
  • Prescribed medications for upper respiratory congestion.
  • Medications prescribed to treat asthma
  • Some medications used to treat high blood pressure.
  • Some medications used to treat depression, anxiety, and schizophrenia.

Other Causes of Insomnia

  • Common stimulants associated with poor sleep include caffeine and nicotine. You should consider not only restricting caffeine and nicotine use in the hours immediately before bedtime but also limiting your total daily intake.
  • People often use alcohol to help induce sleep, as a nightcap. However, it is a poor choice. Alcohol is associated with sleep disruption and creates a sense of non-refreshed sleep in the morning.
  • A disruptive bed partner with loud snoring or periodic leg movements also may impair your ability to get a good night's sleep.
Medically Reviewed by a Doctor on 12/8/2014

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Read What Your Physician is Reading on Medscape

Insomnia »

Insomnia is defined as repeated difficulty with the initiation, duration, maintenance, or quality of sleep that occurs despite adequate time and opportunity for sleep that results in some form of daytime impairment.

Read More on Medscape Reference »


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