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Insomnia

Insomnia is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Insomnia rather than just read about it. In short: Insomnia, also known as sleeplessness, is a sleep disorder causing difficulty falling asleep or staying asleep for as long as desired. Insomnia is typically followed by daytime sleepiness, low energy, irritability, and a depressed mood.

Insomnia — main illustration
Insomnia — illustration

Key takeaways

  • Insomnia belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Insomnia to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Insomnia from memory before moving on to harder problems.

Reference excerpt

Insomnia, also known as sleeplessness, is a sleep disorder causing difficulty falling asleep or staying asleep for as long as desired. Insomnia is typically followed by daytime sleepiness, low energy, irritability, and a depressed mood. It may result in an increased risk of accidents as well as problems focusing and learning. Insomnia can be short-term, lasting for days or weeks, or long-term, lasting more than a month. The concept of the word insomnia has two distinct possibilities: insomnia disorder or insomnia symptoms. Insomnia can occur independently or as a result of another problem. Conditions that can result in insomnia include psychological stress, chronic pain, heart failure, hyperthyroidism, heartburn, restless leg syndrome, perimenopause, menopause, certain medications, and use of drugs such as caffeine, nicotine, and alcohol. Risk factors include working night shifts and sleep apnea. Diagnosis is based on sleep habits and an examination to look for underlying causes. A sleep study may be done to look for underlying sleep disorders. Screening may be done with questions like "Do you experience difficulty sleeping?" or "Do you have difficulty falling or staying asleep?" Cognitive behavioral therapy is considered the first-line treatment. Sleep hygiene and lifestyle changes are also recommended for insomnia, though their efficacy is not definitely established. Sleep hygiene includes a consistent bedtime, a quiet and dark room, exposure to sunlight during the day and regular exercise. Sleeping pills can improve sleep, though some are associated with falls, cognitive impairment, and dependence. These medications are not recommended for more than four or five weeks but can be used longer in certain instances. Among these, lemborexant and eszopiclone have the most favorable efficacy and safety profiles. The efficacy and safety of alternative medicine treatments are unclear. Between 10% and 30% of adults have insomnia at any given point in time, and up to half of people have insomnia in a given year. About 6% of people have insomnia that is not due to another problem and lasts for more than a month. People over the age of 65 are affected more often than younger people. Women are more often affected than men. Descriptions of insomnia occur at least as far back as ancient Greece. Anthropological research has also examined how insomnia and sleep disturbance may be influenced by cultural, social, and biological factors working together. Research on industrialisation has considered the effects of artificial light, urban development, and changing work habits on sleep, suggesting that experiences of insomnia are not shaped solely by biological processes. Cross-cultural research has also shown that ideas about what constitutes ‘normal’ sleep can vary between societies, influencing how sleep difficulties are understood and experienced.

Signs and symptoms

Symptoms of insomnia:

Difficulty falling asleep, including difficulty finding a comfortable sleeping position Waking during the night, being unable to return to sleep, and waking up early Not able to focus on daily tasks, difficulty in remembering Daytime sleepiness, irritability, depression or anxiety Feeling tired or having low energy during the day Trouble concentrating Being irritable, acting aggressive, or impulsive Memory impairment Sleep onset insomnia is difficulty falling asleep at the beginning of the night, often a symptom of anxiety disorders. Delayed sleep phase disorder can be misdiagnosed as insomnia, as sleep onset is delayed much later than normal, while awakening spills over into daylight hours. It is common for people who have difficulty falling asleep to also have nocturnal awakenings with difficulty returning to sleep. Two-thirds of these people wake up in the middle of the night, with more than half having trouble falling back to sleep after a middle-of-the-night awakening. Early morning awakening occurs earlier (more than 30 minutes) than desired, with an inability to go back to sleep and before total sleep time reaches 6.5 hours. Early morning awakening is often a characteristic of depression. Anxiety symptoms may well lead to insomnia. Some of these symptoms include psychological stress, compulsive worrying about the future, feeling overstimulated, and overanalyzing past events. Chronic insomnia may take a mental toll, affecting social interactions, work, and lifestyle.

Poor sleep quality Poor sleep quality can occur as a result of, for example, restless legs, sleep apnea, or major depression. Poor sleep quality is defined as the individual not reaching stage 3 or delta sleep, which has restorative properties. Major depression leads to alterations in the function of the hypothalamic–pituitary–adrenal axis, causing excessive release of cortisol, which can lead to poor sleep quality. Nocturnal polyuria, excessive night-time urination, can also result in a poor quality of sleep.

Subjectivity

Sleep state misperception is a condition where people believe that they have been awake all night even though sleep tests prove that they have slept for hours. Also called paradoxical insomnia or subjective insomnia, paradoxical insomnia may affect only about 5% of people with insomnia. Despite sleeping for multiple hours each night and typically not experiencing significant daytime sleepiness or other symptoms of sleep loss, patients feel like they have not slept very much, if at all. They incorrectly believe it takes them an abnormally long time to fall asleep, and they underestimate how long they stay asleep.

Problematic digital media use

Causes While insomnia can be caused by many conditions, it can also occur without any identifiable cause. This is known as Primary Insomnia. Primary Insomnia may also have an initial identifiable cause but continues after the cause is no longer present. For example, a bout of insomnia may be triggered by a stressful work or life event. However, the condition may continue after the stressful event has been resolved. In such cases, the insomnia is usually perpetuated by the anxiety or fear caused by the sleeplessness itself, rather than any external factors. Symptoms of insomnia can be caused by or associated with:

… excerpt ends here. Continue reading the full article.

Illustrations

Insomnia illustration
Insomnia: Potential complications of insomnia[17]
Potential complications of insomnia[17]
Insomnia: Normison (temazepam) is a benzodiazepine commonly prescribed for insomnia and other sleep disorders.[159]
Normison (temazepam) is a benzodiazepine commonly prescribed for insomnia and other sleep disorders.[159]
Insomnia: Disability-adjusted life year for insomnia per 100,000 inhabitants in 2004:.mw-parser-output .div-col{margin-top:0.3em;column-width:30em}.mw-parser-output .div-col-small{font-size:90%}.mw-parser-output .div-col-rules{column-rule:1px solid #aaa}.mw-parser-output .div-col dl,.mw-parser-output .div-col ol,.mw-parser-output .div-col ul{margin-top:0}.mw-parser-output .div-col li,.mw-parser-output .div-col dd{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .legend{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .legend-color{display:inline-block;min-width:1.25em;height:1.25em;line-height:1.25;margin:1px 0;text-align:center;border:1px solid black;background-color:transparent;color:black}.mw-parser-output .legend-text{}  no data
  less than 25
  25–30.25
  30.25–36
  36–41.5
  41.5–47
  47–52.5
  52.5–58
  58–63.5
  63.5–69
  69–74.5
  74.5–80
  more than 80
Disability-adjusted life year for insomnia per 100,000 inhabitants in 2004:.mw-parser-output .div-col{margin-top:0.3em;column-width:30em}.mw-parser-output .div-col-small{font-size:90%}.mw-parser-output .div-col-rules{column-rule:1px solid #aaa}.mw-parser-output .div-col dl,.mw-parser-output .div-col ol,.mw-parser-output .div-col ul{margin-top:0}.mw-parser-output .div-col li,.mw-parser-output .div-col dd{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .legend{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .legend-color{display:inline-block;min-width:1.25em;height:1.25em;line-height:1.25;margin:1px 0;text-align:center;border:1px solid black;background-color:transparent;color:black}.mw-parser-output .legend-text{}  no data   less than 25   25–30.25   30.25–36   36–41.5   41.5–47   47–52.5   52.5–58   58–63.5   63.5–69   69–74.5   74.5–80   more than 80

Worked examples

Example 1 — a first encounter with Insomnia

Start with the simplest possible case. Write down what Insomnia claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Insomnia before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Insomnia ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Insomnia

In research
Insomnia appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Insomnia in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Insomnia is common in secondary-school and first-year university syllabi. It links to neighbouring topics Insomnia, Sleep disorders, Sleeplessness and sleep deprivation, so understanding it makes those chapters shorter.
In everyday life
Look for Insomnia outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Insomnia in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Insomnia means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Insomnia out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Insomnia in simple terms?

Insomnia, also known as sleeplessness, is a sleep disorder causing difficulty falling asleep or staying asleep for as long as desired. Insomnia is typically followed by daytime sleepiness, low energy, irritability, and a depressed mood.

Why does Insomnia matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Insomnia?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Insomnia.

Tags

  • Insomnia
  • Sleep disorders
  • Sleeplessness and sleep deprivation

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