Primary insomnia is quite common. The International Classification of Sleep Disorders defines primary insomnia as a syndrome that includes psychophysiological insomnia, paradoxical insomnia, and idiopathic insomnia. Primary insomnia is defined as difficulty falling asleep (sleep onset insomnia), difficulty staying asleep (mid-sleep awakening, early morning awakening), or chronic non-restorative sleep that lasts more than three weeks despite adequate sleep opportunity and results in impaired daytime functioning. There are no known psychiatric disorders, medical conditions, or substance use disorders that explain primary insomnia. Primary insomnia is a non-organic sleep disorder with an unknown aetiology that primarily affects middle-aged females. Recent research points to the hyperarousal hypothesis of primary insomnia. Non-restorative sleep may be excluded from the definition of primary insomnia in the near future.
10% to 40% of adults have intermittent insomnia, and 15% have long-term sleep problems. This article examines the classification, differential diagnosis, and treatment options for insomnia. OVID and the key words “insomnia,” “sleeplessness,” “behaviour modification,” “herbs,” “medicinal,” and “pharmacologic therapy” were used in a MEDLINE search. Articles were chosen for their relevance to the topic. A careful sleep history, review of medical history, review of medication use (including over-the-counter and herbal medications), family history, and screening for depression, anxiety, and substance abuse are all part of the evaluation of insomnia. Treatment should be tailored to the nature and severity of the symptoms. When compared to drug therapies, nonpharmacologic treatments are more effective and have fewer side effects. Initially, medications like diphenhydramine, doxylamine, and trazodone can be used, but patients may not tolerate their side effects. Newer medications with short half-lives and few side effects include zolpidem and zaleplon. Both are approved for short-term use in the treatment of insomnia.
Many people have trouble sleeping. According to a Gallup poll conducted in 1995, 49% of adults were dissatisfied with their sleep at least 5 nights per month.
1 According to population-based studies, 10% to 40% of American adults have intermittent insomnia, and 10% to 15% have long-term sleep problems.
2 Insomnia has been linked to decreased work performance as well as an increase in motor vehicle accidents and hospitalisation rates.
3 The annual cost of lost productivity and insomnia-related accidents is estimated to be more than $100 billion.
4 The goal of this review is to provide a current overview of insomnia classification, differential diagnosis, and treatment options. OVID and the key words “insomnia,” “sleeplessness,” “behaviour modification,” “herbs,” “medicinal,” and “pharmacologic therapy” were used in a MEDLINE search. Two of the authors reviewed the abstracts (ENR, SLP). The articles were then chosen based on their relevance to the topical review.
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Classification
Insomnia is defined as a complaint about the quantity, quality, or timing of sleep that occurs at least three times per week for at least one month in the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV)5 of the American Psychiatric Association. Rapid eye movement (REM) sleep and non-REM sleep are two types of sleep. There are 4 stages of non-REM sleep, each getting deeper. Deep restorative sleep is also referred to as slow wave or sleep in stages 3 and 4. Sleep quality declines as stage 3 and stage 4 time is reduced. REM sleep is stage 5 sleep. 6 According to research, insomnia is characterised by a sleep latency of more than 30 minutes, a sleep efficiency of less than 85%, or a sleep disturbance occurring more than three times per week.
Insomnia is categorised as a dyssomnia in the International Classification of Sleep Disorders.
8 Insomnia, which is the inability to fall asleep or stay asleep, and excessive sleeping are examples of dysomnias (hypersomnia). Numerous insomnia-related complaints are difficult to classify. Patients who experience sleep state misperception insomnia complain of not sleeping for a long time despite having no real difficulty falling asleep. Some patients sleep less because of their social or professional obligations (self-imposed short total sleep time), or they naturally sleep fewer hours than they need to.
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