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Insomnia is defined as a state of sleeplessness.


Patients with insomnia have impaired daytime function due to difficulty initiating sleep, difficulty maintaining sleep, or waking up early in the morning without ability to return to sleep [7]. They complain of fatigue, loss of energy, depression and irritability during the day and disturbed sleep during the night. A detailed history may reveal the use of certain medication that may point towards an underlying disease. If the patient is suffering from a psychological condition, it may present with characteristic symptoms like delusions, hallucinations, confusion, anxiety, depression and personality changes. If the insomnia is associated with other diseases, presenting complains of insomnia will be accompanied with systemic signs and symptoms.

  • The most common one is insomnia, which can exacerbate other post-injury symptoms, including fatigue, impaired cognition, depression, anxiety, and pain.[ncbi.nlm.nih.gov]
  • However, both treatments were better than waitlist in reducing insomnia, anxiety/depressive symptoms and fatigue, and improving function. Within-group improvements were maintained at 13 weeks after treatment.[ncbi.nlm.nih.gov]
  • After acupuncture treatment, improvements in subjective symptoms such as unrefreshing sleep, morning headache, reduced motivation and daytime performance, tiredness, sleep disturbances, fatigue, and mood worsening in the morning were also observed.[ncbi.nlm.nih.gov]
  • After acupuncture treatment, improvements of subjective symptoms such as unrefreshing sleep, sleep disturbances, accompanied symptoms (morning headache, fatigue, and mood worsening) were observed.[ncbi.nlm.nih.gov]
  • A 70-year-old Caucasian man developed, in the course of 3 months, polyneuropathy with unpleasant dysesthesia of lower extremities and gradually increasing fasciculations, muscle stiffness and fatigue.[ncbi.nlm.nih.gov]
  • Given the methodological weaknesses of studies reviewed, additional research is needed to determine the efficacy of insomnia treatment in improving rates of alcohol relapse within this population.[ncbi.nlm.nih.gov]
  • Tiredness, lethargy, dyspnoea, pruritus, insomnia , weakness and deterioration in mobility are common and have significant impact on the quality of life. The judge recognized the solicitor of the criminal who was suffering from insomnia .[dictionary.cambridge.org]
  • . — Jason Gay, WSJ , "The Nightmare of Baseball (and Basketball) Bedtimes," 24 Oct. 2018 The most common is headache, usually located at the back of the head and down the neck, but a wide variety of other symptoms can occur, ranging from weakness, fainting[merriam-webster.com]
  • […] insomnia in a Sentence has suffered from insomnia virtually his entire life Recent Examples on the Web The most common is headache, usually located at the back of the head and down the neck, but a wide variety of other symptoms can occur, ranging from weakness[merriam-webster.com]
  • Increased risk for medical conditions These include: stroke asthma attacks seizures weak immune system sensitivity to pain inflammation obesity diabetes mellitus high blood pressure heart disease 2.[healthline.com]
Nocturnal Awakening
  • Increased cortisol response and elevated sympathovagal imbalance (ie, low frequency/high frequency ratio) were each significantly associated with longer nocturnal awakenings (p 0.048, p 0.037, respectively).[ncbi.nlm.nih.gov]
  • Thus, the presence of a long sleep latency, frequent nocturnal awakenings, or prolonged periods of wakefulness during the sleep period or even frequent transient arousals are taken as evidence of insomnia. 1 Thus, insomnia has been thought of both as[ncbi.nlm.nih.gov]
  • They may also have frequent nocturnal awakenings because of nocturia.[emedicine.medscape.com]
  • Patients and volunteers who participated in the study were assessed with the Inventory of Statements About Self-injury (ISAS), Dutch Eating Behavior Questionnaire (DEBQ), Pittsburgh Sleep Quality Index (PSQI), Insomnia severity index (ISI), and the Difficulties[ncbi.nlm.nih.gov]
  • […] insomnio (situación) , [D]insomnio, SAI , insomnio, SAI (trastorno) , [D]insomnio , insomnio, SAI , desvelo , insomnio [Ambiguo] (trastorno) , insomnio (concepto no activo) , insomnio (trastorno) , insomnio , Insomnio Italian Insonnia , Insonnia NAS Dutch[fpnotebook.com]
  • American English : insomnia Arabic : أَرَقٌ Brazilian Portuguese : insônia Chinese : 失眠 Croatian : nesanica Czech : nespavost Danish : søvnløshed Dutch : slapeloosheid European Spanish : insomnio Finnish : unettomuus French : insomnie German : Schlaflosigkeit[collinsdictionary.com]
Chronic Fatigue Syndrome
  • fatigue syndrome Fibromyalgia Neurologic disorders Neurologic disorders may include Parkinson disease, other movement disorders, and headache syndromes, particularly cluster headaches, which may be triggered by sleep.[emedicine.medscape.com]
Heart Disease
  • Also, deterioration in depression and heart disease status and increased number of conditions over time increased the risk for insomnia incidence.[ncbi.nlm.nih.gov]
  • The primary insomnia cohort had a higher prevalence of diabetes, dyslipidemia, hypertension, coronary heart disease, chronic liver disease, and chronic kidney disease at baseline.[ncbi.nlm.nih.gov]
  • Other causes include preexisting medical conditions like heart disease, gastrointestinal problems, urinary problems, persistent pain, hypertension or respiratory problems.[symptoma.com]
  • Insomnia is linked to a number of other health disorders, from heart disease to arthritis. People experiencing insomnia have a significantly increased risk of developing depressive disorder.[sleepdex.org]
  • Increased risk for medical conditions These include: stroke asthma attacks seizures weak immune system sensitivity to pain inflammation obesity diabetes mellitus high blood pressure heart disease 2.[healthline.com]
Sleep Disturbance
  • Recent research suggests that sleep disturbance amplifies the effect of maladaptive emotional processes on PTSD symptom severity.[ncbi.nlm.nih.gov]
  • This case report aims to illustrate the possibility of rectifying sleep disturbances comorbid with social phobia, using a brief cognitive behaviour therapy for insomnia (CBT-I).[ncbi.nlm.nih.gov]
  • Preliminary work has been conducted on mindfulness-based therapy for insomnia (MBT-I), a meditation-based program for individuals suffering from chronic sleep disturbance.[ncbi.nlm.nih.gov]
  • We would advise consideration be given to the possibility of OSAHS in a patient presenting with an oropharyngeal tumour and sleep disturbance and would also suggest caution in the prescription of benzodiazepines and other sedative medication to this group[ncbi.nlm.nih.gov]
  • These findings add to our knowledge of the phenotypic variability of human prion diseases with prominent sleep disturbances.[ncbi.nlm.nih.gov]
  • This study highlights that it is a major public health concern, albeit neglected, which needs to be dealt as a priority.[ncbi.nlm.nih.gov]
Focal Neurologic Deficit
  • On initial examination, he was awake, apathetic, and disoriented but had no focal neurological deficits. Electroencephalography showed diffuse background slowing with neither periodic discharge nor sleeping activity.[ncbi.nlm.nih.gov]


Physical examination may offer clues to underlying medical disorders predisposing to insomnia [8]. A detailed history is imperative in making the right diagnosis.

Laboratory tests

  • Arterial blood gases
  • Blood oximetry
  • Routine blood tests like complete blood count (CBC), prothrombin time, thyroid function tests, liver function tests, kidney function tests to rule out underlying disease.


  • ECG
  • Polysomnography
  • Actigraphy
  • Radiography and CT scan to exclude other diseases

Test results

The diagnosis of insomnia is a difficult one and is easily confused with sleep apnea. A detailed history and the use of a sleep diary or log book can aid in making the right diagnosis.

Epileptiform Activity
  • We report a novel case of "grand mal on awakening" from sleep presenting with intractable insomnia associated with interictal epileptiform activity (IEA) during sleep.[ncbi.nlm.nih.gov]



Since insomnia can precipitate, exacerbate, or prolong comorbid conditions, treatment of insomnia may improve comorbidities [9]. Treatment is based on chemotherapy that includes sedatives like benzodiazepines, and non-benzodiazepines receptor agonists like Zolpidem and Eszopiclone. Other drugs that can be used to treat or at least provide symptomatic relief include Melatonin, or Melatonin-receptor agonists like Ramelteon, Orexin receptor antagonist like Suvorexant, sedative anti-depressants like Doxepin, and antihistamines.

Non-pharmalogical treatment

It includes hypnotic treatment to induce and improve sleep and cognitive behavioural therapy (CBT). CBT is a good way of treating insomnia and is recommended along with pharmacological treatment.


Insomnia may disappear on its own if the predisposing factor is removed or treated. In cases where the predisposing factor(s) or underlying condition persists, insomnia is a progressive disease. It may begin with disturbed sleep and progress to severe depression, loss of memory and a reduced quality of life. People who are able to sleep for only 5 hours or less on long term basis have high mortality rates.


Insomnia has a diverse range of potential causes. First and foremost is stress. Stress could be due to personal, professional, social or financial conditions which would make the person anxious and depressed, causing insomnia. Some patients may be insomniacs due to a genetic predisposition. A missense mutation has been found in the gene encoding the GABAA beta 3 subunit in a patient with chronic insomnia [3].

Other causes include preexisting medical conditions like heart disease, gastrointestinal problems, urinary problems, persistent pain, hypertension or respiratory problems. Restless legs syndrome or periodic limb movement disorder may be causing insomnia and so can be mental disorders like PTSD, schizophrenia and bipolar disorder. Hormone shifts, like those occurring during premenstrual syndrome (PMS) or pregnancy, increased use of nicotine and caffeine, and some stimulant medications like amphetamines may cause insomnia.



It is a very common medical complaint in primary care patients and the same is true for patients in palliative care, which is illustrated by studies that report the prevalence of insomnia is over 70 percent [4].


Insomnia is very rare in children, unless it is accompanied with a medical condition that disturbs sleep. Acute insomnia can affect adolescents and old aged people alike but is generally a frequent complain of people in the prime of life. Chronic insomnia on the other hand is much more common in the elderly.


Insomnia is 40% more common in women than in men [5].

Sex distribution
Age distribution


The DSM-5 criteria for insomnia include the following [6]:

Difficulty initiating and maintaining sleep, and difficulty going back to sleep after awakening early. The symptoms must be present at least 3 times a week for 3 months to be declared insomnia. The symptoms should also persist despite adequate opportunities to sleep and without any effects of drugs, narcotics or alcohol.


Although insomnia can be classified into many subtypes, it can be divided into 3 broad categories:

  • Acute insomnia

It lasts for less than a month and then goes away on its own. It is triggered by either environmental factors such as travelling, change in environment, change in routine, or stress and depression. It is also known as transient insomnia (symptoms lasting for less than a week) and adjustment insomnia.

  • Primary insomnia

This condition fits the DSM-5 criteria for insomnia. It is characterized by inability to sleep during desired time or inability to maintain sleep for a longer time. The duration of sleep may be punctuated by periods of heightened awareness of the surroundings, heightened somatic tension and intrusive thoughts.

  • Chronic insomnia

This condition lasts for more than 1 month and is mostly due to a medical condition such as heart disease, breathing problems, conditions causing nocturia, diseases associated with persistent pain like arthritis, hypertension or gastrointestinal problems. If chronic insomnia exists without an underlying medical condition, it is due to high stress.


Good sleep hygiene plays an important role in preventing insomnia. It includes setting up and maintaining a regular sleep schedule with regular sleep and wakening timings, avoiding caffeinated drinks and high sugar containing food a few hours before going to bed. A calm quiet environment and a healthy diet and lifestyle also go a long way in helping attain good sleep.


Insomnia was previously viewed as a sleep disturbance that was secondary to a medical condition, psychiatric illness, sleep disorder, or medication, and would improve with treatment of the underlying disorder [1]. But now, insomnia is recognized as an independent disorder [2]. It is a common complaint in outpatient care departments and is most frequently associated with stress.

Patient Information


Insomnia is defined as a condition of sleeplessness. There may be inability to fall asleep, maintain sleep or to go back to sleep after awakening early. 


Insomnia is primarily due to stress. Other causes include heart, gastrointestinal and urinary diseases, breathing problems, pain, mental conditions, disrupted sleep schedule or lifestyle, environmental change, drug side effects and genetic factors.

Signs and symptoms

Insomnia often coexists with other symptoms, such as pain, depression, and anxiety and the presence of one often exacerbates the other, contributing to a decrease in quality of life [10]. It presents with inability to fall asleep or maintain sleep for longer than a few hours at night, and irritability, tiredness and loss of energy during the day. 


Insomnia is diagnosed by excluding other underlying diseases that may be causing sleep disturbances. A thorough physical examination and laboratory tests aid in that endeavour. A detailed history helps in making the right diagnosis.


Treatment includes the use of prescribed drugs along with cognitive behavioural therapy. Lifestyle changes also help. 



  1. National Institutes of Health. National Institutes of Health State of the Science Conference statement on Manifestations and Management of Chronic Insomnia in Adults, June 13-15, 2005. Sleep 2005; 28:1049.
  2. Katz DA, McHorney CA. Clinical correlates of insomnia in patients with chronic illness. Arch Intern Med 1998; 158:1099.
  3. Buhr A, Bianchi MT, Baur R, Courtet P, Pignay V, Boulenger JP, et al. Functional characterization of the new human GABA(A) receptor mutation beta3(R192H). Hum Genet. Aug 2002;111(2):154-60
  4. Hugel H, Ellershaw JE, Cook L, et al. The prevalence, key causes and management of insomnia in palliative care patients. J Pain Symptom Manage 2004; 27:316.
  5. "Several Sleep Disorders Reflect Gender Differences". Psychiatric News 42 (8): 40. 2007.
  6. "Sleep Wake Disorders." Diagnostic and statistical manual of mental disorders: DSM-5.. 5th ed. Washington, D.C.: American Psychiatric Association, 2013
  7. International Classification of Sleep Disorders, 3rd ed, American Academy of Sleep Medicine, Darien, IL 2014
  8. Schutte-Rodin S, Broch L, Buysse D, Dorsey C, Sateia M. Clinical guideline for the evaluation and management of chronic insomnia in adults. J Clin Sleep Med. Oct 15 2008;4(5):487-504 
  9. Sack RL, Auckley D, Auger RR, et al. Circadian rhythm sleep disorders: part II, advanced sleep phase disorder, delayed sleep phase disorder, free-running disorder, and irregular sleep-wake rhythm. An American Academy of Sleep Medicine review. Sleep 2007; 30:1484.
  10. Glynn J, Gale S, Tank S. Causes of sleep disturbance in a specialist palliative care unit. BMJ Support Palliat Care 2014; 4 Suppl 1:A56.

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Last updated: 2017-08-09 18:14