Sleep is becoming an increasingly precious commodity as more and more people are reporting issues with sleep in our busy society. Problems with sleep fall under the term insomnia. These can further subdivide into short term insomnia and chronic insomnia. This article explores short-term insomnia and its various aspects.
DSM-5 classifies insomnia disorders as dissatisfaction with sleep quantity/quality due to difficulty initiating sleep, maintaining sleep, or inability to return to sleep despite adequate opportunity for sleep. This condition causes distress and impairment in daytime functioning such as fatigue/low energy, daytime sleepiness, impaired attention/concentration, mood disturbances, among other impairments. These disturbances with sleep are not related to any other medical disorder, substance use, or prescription use, and the symptoms must be present at least three nights per week for at least three months.
It is important to note that insomnia previously subdivided into many different types of insomnia, including primary and secondary insomnia. Recently, these categories were changed to short term insomnia, chronic insomnia, and other insomnia. Other previously used subtypes now under chronic insomnia included paradoxical insomnia, idiopathic insomnia, psychophysiological insomnia, inadequate sleep hygiene, among others. These subtypes were recently removed in the new ICSD-III.
The cause of short term insomnia is not well understood and are not attributable to one single etiology. The etiology of insomnia involves many factors, including environmental, genetic, psychological, and behavioral, which lead to a state of hyperarousal.
Up to one-third of the world’s population reports dissatisfaction with their sleep. Amongst the elderly and women, this percentage would be on the higher end. As high as 50% of older adults report sleep disturbances and insomnia. Using the DSM-5 criteria, up to 10% to 15% of adults would be classified as having short term insomnia. Women are two times as likely to have insomnia than age-matched men.
The exact mechanism causing short term insomnia remains unknown, even though there are many proposed models. There is an emerging consensus that short term insomnia is a disorder of hyperarousal.
Hyperarousal is a state of increased somatic, cortical, and cognitive activation. Measured in physiologic terms, this would mean that patients with short term insomnia would demonstrate increases in cortisol levels, body temperature, 24-hour metabolic rate, and heart rate.
There is also a growing body of knowledge that links short term insomnia to the upregulation of wake-promoting chemicals of orexin (also known as hypocretin), histamine, and catecholamines. The presence of these chemicals couples with the downregulation of the sleep-promoting chemicals adenosine, serotonin, melatonin, and GABA. More research is necessary regarding the precise molecular mechanism responsible for hyperarousal.
Patients with short term insomnia have a constellation of symptoms and perceived issues with the quantity or quality of sleep. Symptoms include difficulty initiating and maintaining sleep, early morning awakenings, and difficulty going back to sleep. It is important to note that these symptoms exist even though the patient has the opportunity to get adequate sleep. The evaluation should include a thorough medical and psychiatric history. A sleep diary kept over a 2 to 4 week period may be helpful to assess sleep patterns.
Another vital aspect of a patient’s history is that the nighttime issues with sleep contribute to daytime consequences such as:
Evaluators should also perform questioning to rule out sleep-related disorders such as sleep apnea, narcolepsy, or restless leg syndrome.
New research also indicates that there may be an independent association of insomnia contributing to major depression, and patients may present with depressed mood and complaints of anhedonia.
Evaluating for short term insomnia hinges on obtaining a robust sleep history as the diagnosis is made clinically. It is also essential to rule out other causes of insomnia, including but not limited to medication or substance use, or medical or mental disorders. Polysomnography testing plays a very limited role, but it can help differentiate sleep apnea and other sleep disorders from short term insomnia. The use of sleep diaries and sleep logs have an essential role in helping to diagnose short term insomnia. Patients are generally asked to note their sleep patterns such as time in bed, nighttime awakenings, sleep satisfaction, sleep onset latency, and total sleep time. These are measured from two to four weeks and are brought in for the clinician to review.
The two main classifications systems that define insomnia disorders are the International Classification of Sleep Disorders, 3rd edition (ICSD-III), and the Diagnostic and Statistical Manual-5 (DSM-5). The ICSD-III classifies insomnia into three categories: Chronic Insomnia Disorder, Short-term Insomnia Disorder, and Other Insomnia Disorder. The DSM-5 criteria take a descriptive approach based on the frequency and duration of symptoms.
Questionnaires such as the Insomnia Severity Index (ISI) and the Pittsburgh Sleep Quality Index (PSQI) is a tool to aid in the diagnosis of insomnia. The Insomnia Severity Index consists of seven questions with a score of 1-4. The maximum score is 28, and the higher the score, the worse insomnia. A score of greater than 14 indicates clinical insomnia. The questionnaire can be self-administered by patients and brought in for evaluation by the provider. The PSQI was developed to help differentiate between different sleep-related disorders. It consists of 19 questions and measures different domains of sleep (quality, latency, duration, efficacy, medication use, daytime symptoms, and disturbances) over a month.
Currently, two modalities help with objectively measuring sleep activity: actigraphy and polysomnography. Actigraphy is a technique for measuring limb movement activity with actigraphic devices that are wearable on wrists or ankles. The data for movement activity is then gathered over a period, ultimately giving us patterns for wakefulness and sleep. With the patterns, general sleep parameters, including sleep latency, sleep efficiency, total sleep time, and wake after sleep onset, can be obtained. These parameters would greatly aid in evaluating insomnia. Non-REM and REM sleep cycles, however, can not be gathered and need polysomnography to assess. Although polysomnography is the golden standard in measuring sleep-related disorders, it should not be used routinely for diagnosing insomnia. In insomnia cases, it is usually indicated when there is suspicion that another sleep-related disorder is possible. Such conditions would include breathing disorders such as obstructive sleep apnea, central sleep apnea, or sleep-related movement disorders (i.e., periodic limb movement disorder).
Treatment of short term insomnia divides into two sections: nonpharmacologic and pharmacologic. Nonpharmacologic treatment is the first line as it is more cost-effective with a less side effect profile. Studies have shown nonpharmacologic therapy to be as effective as pharmacologic treatments. In more complicated patients with long histories of insomnia, it is permissible to combine pharmacologic and nonpharmacologic therapies.
There is an abundance of pharmacologic therapies that exist for treating insomnia. These consist of herbs and over the counter melatonin pills and prescription drugs. Melatonin is an endogenous hormone produced by our pineal gland when stimulated by the suprachiasmatic nuclei in response to light, or lack thereof. The response of melatonin on our body is complex, but in essence, it regulates the circadian rhythm and aids in sleep onset. Over the counter, melatonin tablets are available in 1 mg to 10 mg dosages and have demonstrated modest effects on sleep onset.
Herbs have been used for centuries to induce sleep and aid in relaxation. Some of the popular herbs used include valerian root, kava-kava, chamomile, and lavender. Valerian root is a well-known herb that works on the GABA-A receptor to help with insomnia. Kava-kava is an extract from the herb Piper methysticum used in the South Pacific for insomnia and anxiety. It also works on the GABA receptor. Another popular herb that has its effect by modulating the GABA receptor is chamomile, a flower native to Europe and Western Asia. Recent data shows that it has a modest impact on daytime functioning in patients who have insomnia. Lavender is a familiar flower whose essential oil is often used in aromatherapy. Research on the effect of aromatherapy with lavender indicates that it raises the serum melatonin levels in the blood, thus promoting sleep. These herbs are only the tip of the iceberg as many other herbs have been used for centuries to treat insomnia and anxiety, including Chinese herbs not mentioned in this article.
Regarding prescribed drugs, although there are no agreed-upon guidelines for prescribing, the American Academy for Sleep Medicine (AASM) assigned a task force of four experts in sleep medicine. It published a practice guideline for chronic insomnia in 2017. This guideline gives recommendations for each of the prescription drugs. Below is a concise list of medications along with their starting doses used in insomnia disorders. If one medication does not work or has a side effect profile not conducive to a patient’s lifestyle or physiology, clinicians can always switch to other medications. Clinicians are also encouraged to look up the side effect profile of each drug and its interactions. It is also important to note that all prescription drugs have adverse effects including but not limited to addiction, withdrawal, and tolerance, and should be used for a short duration if not effective.
In the elderly, it becomes important to consider the Beers criteria for proper prescribing. Drugs to be avoided include benzodiazepines, antihistamine drugs, TCAs, among other drugs.
The following is a list of diagnoses to rule out before the diagnosis of short term insomnia can be made:
Sleep is vital to a patient’s overall health and feeling of wellbeing. There is emerging evidence tying sleep disturbances and insomnia disorders to increased cardiometabolic morbidity and mortality. Due to the hyperarousal state, patients with insomnia have a higher incidence of hypertension, type 2 diabetes, and acute myocardial infarction. These states mostly relate to the hypercortisolemia effect of insomnia by way of causing stress. Other studies show a correlation between insomnia and neurocognitive decline; this includes impairments in memory, executive functions, and attention. These impairments overtime then give way to developing psychiatric disorders such as depression, anxiety, and even suicide. The long term prognosis, however, of short term insomnia is very good if interventions and treatments are made appropriately and promptly.
Untreated and unrecognized short term insomnia can lead to a host of complications. Thus, in treating patients, it would be prudent for a provider to be aware of these complications. Below is a list of the following known complications:
To gain an understanding of short term insomnia, patients need to gain an appreciation for how sleep works. Proper sleep education and relearning how to sleep are essential hallmarks of treating insomnia. Because short term insomnia did not develop overnight, it would be of utmost value to make patients aware that the treatment of short term insomnia will take time and require a change in behavior, habits, and environment.
Short term insomnia is one of the most common diagnoses seen in medical practice. Most patients are treated by their primary care provider using simple behavioral interventions or brief pharmacologic courses. However, some cases will require referrals to sleep medicine specialists, psychiatrists, and/or clinicians who perform cognitive-behavioral therapy.
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