Insomnia

Insomnia, or sleeplessness, is a common sleep disorder that affects a significant portion of the population. Around 10% to 30% of the world’s population is said to have chronic insomnia (Pradhan & Saikia, 2024).

It can lead to daytime fatigue, impaired cognitive function, and a decreased quality of life. Understanding the causes, symptoms, and available treatments for insomnia is crucial for those seeking to improve their sleep and overall well-being. Here, we will delve into the details of insomnia and explore potential solutions for this sleep disorder.

What is Insomnia?

Insomnia is a sleep disorder characterised by difficulty falling asleep, staying asleep, or both, despite having adequate time and a bedroom environment conducive to restful sleep. It can be classified as acute, lasting from a few days to a few weeks, or chronic, persisting for more than three months. Common symptoms of insomnia include daytime fatigue, impaired attention or memory, irritability, and mood disturbances. Insomnia can affect people of all ages and backgrounds, with some groups, such as older adults and women, being more susceptible to sleep problems.

According to the American Academy of Sleep Medicine, insomnia can be broadly categorised into two types: primary and secondary. Primary insomnia can be of the following types based on its duration and the specific sleep issues encountered:

• Acute Insomnia: This short-term form of insomnia often lasts from a few days to a few weeks. Stressful events, changes in sleep environment, or temporary discomfort commonly trigger it.
• Chronic Insomnia: Chronic insomnia persists for at least 3 nights a week for 3 months or more. It can be primary (idiopathic) or secondary (comorbid), often associated with other medical conditions, mental health issues, or substance use.
• Onset Insomnia: This type involves difficulty initiating sleep and can be either acute or chronic in nature. It is frequently caused by stress, anxiety, or environmental changes, leading to sleeplessness.
  • Maintenance Insomnia: This refers to difficulty staying asleep or waking up too early and struggling to fall back asleep. It is often linked to chronic medical conditions, mental health disorders, or lifestyle factors, resulting in fragmented sleep and daytime fatigue.
• Behavioural Insomnia of Childhood (BIC): BIC affects children and is categorised into three subtypes: sleep-onset, limit-setting, and combined type, often resulting from negative sleep associations or refusal to go to bed.

Insomnia is characterised by a range of symptoms that can significantly impact an individual's daily life. Common symptoms include:

• Difficulty falling asleep despite being tired
• Waking up frequently during the night and having trouble returning to sleep
• Waking up too early in the morning
• Feeling unrefreshed or tired upon waking
• Daytime fatigue, sleepiness, and irritability
• Difficulty concentrating, focusing, and making decisions
• Mood disturbances, such as anxiety or depression

Insomnia can have various underlying causes, which can be categorised as primary or secondary:

Primary Causes:

• Stress related to significant life events
• Environmental factors like noise, light, or temperature
• Changes in sleep schedule, such as jet lag or shift work
• Genetic predisposition

Secondary Causes:

• Mental health issues, such as depression and anxiety
• Medications for various conditions
• Physical discomfort or pain
• Substance use, including caffeine, tobacco, and alcohol
• Other sleep disorders, like sleep apnoea or restless legs syndrome

• Age and gender: Older adults and women are more prone to insomnia, especially during menstruation and menopause (Tandon et al., 2022).
• Medical conditions: Chronic illnesses like GERD, pain disorders, neurodegenerative diseases, and other sleep disorders, such as restless legs syndrome and sleep apnoea, increase the risk.
• Psychiatric disorders: Mental health issues, including depression, anxiety, and mood disorders, are commonly linked to insomnia.
• Lifestyle factors: Irregular sleep schedules, night shifts, long naps near bedtime, excessive caffeine, alcohol, or nicotine use can contribute to sleep problems.
• Stress and worry: Stressful life events, daily concerns, and anxiety about sleep itself can exacerbate the risk of insomnia.
• Genetic predisposition: Family history of insomnia can increase an individual's susceptibility.
• Socioeconomic status: Individuals with lower socioeconomic status and those living in urban areas with higher crime rates and nighttime light exposure are at a higher risk of insomnia.
• Other factors: Pregnancy, hyperthyroidism, ADHD, and certain medications can also lead to the development of insomnia.

• Chronic insomnia can lead to various health risks, including an increased likelihood of developing high blood pressure, obesity, diabetes, and depression. Sleep deprivation can also impair cognitive function, affecting memory, concentration, and decision-making skills, which may result in decreased performance at work or school.
• Insomnia can cause mood disturbances such as irritability, anxiety, and mood swings, which can negatively impact daily life and relationships. Drowsiness from lack of sleep also increases the risk of accidents, particularly when driving or operating machinery.
• Long-term sleep deprivation can weaken the immune system, making you more susceptible to illnesses and infections. Insomnia is also closely linked to mental health issues like depression and anxiety, which can further exacerbate sleep problems.

Preventing insomnia involves adopting healthy sleep habits and making lifestyle changes that promote better sleep. 

• Establishing a consistent sleep schedule is crucial; aim to go to bed and wake up at the same time each day, even on weekends. 
• Create a relaxing bedtime routine that helps you unwind, such as reading a book, taking a warm bath, or practising relaxation techniques like deep breathing or meditation. 
• Optimise your sleep environment by ensuring your bedroom is quiet, dark, and at a comfortable temperature. 
• Avoid using electronic devices, watching television, or working in bed, as these activities can interfere with your ability to fall asleep and get a good night's rest.

It's also important to limit your consumption of stimulants like caffeine, nicotine, and alcohol, especially close to bedtime, as they can disrupt your sleep. While regular physical activity can improve sleep quality, avoid intense exercise in the evening, as it can stimulate the body and make it harder to fall asleep. If you struggle with daytime sleepiness, try to limit or avoid napping, particularly in the late afternoon or evening.

Diagnosing insomnia involves a comprehensive evaluation of the patient's sleep history and symptoms. Healthcare providers typically inquire about the duration and frequency of sleep disturbances, the presence of daytime impairments such as fatigue, impaired memory, and irritability, and any associated stressors or medical conditions. 

The diagnosis may also involve ruling out other sleep disorders that could be causing the symptoms. According to DSM-5 criteria, insomnia is diagnosed if the symptoms persist for at least three months and are not solely due to another sleep disorder, mental disorder, or direct physiological effects of a substance or medical condition. A thorough medical and psychiatric history, along with questions about sleep habits and environment, aids in making an accurate diagnosis of this common sleep disorder.

• Cognitive-behavioural therapy for insomnia (CBT-I): A structured program that helps identify and replace thoughts and behaviours that cause or worsen sleep problems with habits that promote sound sleep.
• Relaxation techniques: Progressive muscle relaxation, guided imagery, and deep breathing exercises can help calm the mind and body before bedtime.
• Sleep hygiene practices: Establishing a regular sleep schedule, creating a conducive sleep environment, avoiding stimulants like caffeine and nicotine close to bedtime, and limiting daytime naps can improve sleep quality.
• Stimulus control therapy: This involves strengthening the association between the bedroom and sleep by limiting activities in bed only to sleep and sexual activity.
• Sleep restriction therapy: Reducing time in bed to the actual amount of sleep time, gradually increasing it until optimal sleep duration is achieved, can help consolidate sleep.
• Light therapy: Exposure to bright light during the day can help regulate the sleep-wake cycle, especially for individuals with circadian rhythm disorders.
• Treating underlying conditions: Addressing any underlying medical or psychiatric conditions that may be contributing to insomnia is essential for effective management.

Medications for Insomnia

While non-pharmacological treatments are preferred, medications may be considered in some instances for short-term relief. These must be used under medical supervision due to potential dependence and side effects. Standard prescription and over-the-counter (OTC) options include:

1. Benzodiazepines [Used short-term for sleep initiation or maintenance]
   • Temazepam: A benzodiazepine that promotes sleep by enhancing GABA activity; used for short-term treatment of insomnia.
   • Lorazepam: May be used in short-term insomnia associated with anxiety.
   • Estazolam: Helps with both sleep initiation and maintenance in short-term insomnia.
   • Triazolam: A short-acting benzodiazepine that helps initiate sleep in transient insomnia.
   • Flurazepam: A long-acting benzodiazepine that improves sleep duration but may cause daytime sedation.
2. Non-benzodiazepine hypnotics (Z-drugs) [Preferred for their shorter half-life and fewer residual effects]
   • Zolpidem: Helps initiate sleep with fewer residual effects; commonly used for short-term insomnia.
   • Zopiclone: Promotes both sleep onset and maintenance with minimal next-day drowsiness.
   • Eszopiclone: A long-acting Z-drug that improves sleep latency and maintenance; approved for long-term use.
   • Zaleplon:  A very short-acting hypnotic effective for reducing sleep latency without morning grogginess.
3. Melatonin receptor agonists [Useful for insomnia related to circadian rhythm disorders]
   • Ramelteon: Mimics melatonin to regulate circadian rhythm; effective for sleep onset insomnia.
   • Melatonin supplements: A natural sleep hormone used to improve the sleep-wake cycle, especially in jet lag or shift work-related insomnia.
4. Dual orexin receptor antagonists (DORAs) [Promote sleep by blocking the wake-promoting orexin system]
   • Suvorexant: Blocks orexin receptors to promote sleep onset and maintenance without GABAergic side effects.
   • Lemborexant: An orexin antagonist that helps regulate sleep-wake cycles; useful in chronic insomnia.
   • Daridorexant: Improves sleep efficiency and quality by inhibiting wake-promoting orexin signalling.
5. Antidepressants with sedative properties [Particularly helpful when insomnia is comorbid with depression or anxiety]
   • Trazodone: A sedating antidepressant that improves sleep continuity, often used in insomnia with depression.
   • Amitriptyline: Used off-label in insomnia associated with chronic pain or depression.
   • Doxepin: Approved at low doses for sleep maintenance and insomnia.
   • Mirtazapine: Enhances sleep by antagonising histamine and serotonin receptors; useful in insomnia with anxiety or depression.
6. Antihistamines (OTC sleep aids) [Can be used short-term, but may cause daytime drowsiness]
   • Diphenhydramine: A sedating antihistamine commonly used in OTC sleep aids; may cause morning drowsiness.
   • Doxylamine: Another OTC antihistamine that induces sleep but may lead to residual sedation.

Note: Medication use should be individualised and periodically reviewed. Long-term pharmacological treatment is generally discouraged unless the benefits outweigh the risks.

If you've been experiencing insomnia or sleeplessness consistently for several weeks or months, it's advisable to consult your doctor. They can help identify any underlying causes of your insomnia, such as medical conditions or medications that may be contributing to your sleep issues. Your doctor can also provide guidance on appropriate insomnia treatments or therapies, which may include lifestyle changes, cognitive-behavioural therapy for insomnia (CBT-I), or prescription sleep medications.

It is important to seek medical advice if your insomnia is accompanied by other symptoms like persistent fatigue, mood changes, or difficulty functioning during the day. In some cases, insomnia may be a symptom of an underlying sleep disorder, such as sleep apnoea or restless legs syndrome, which requires specific treatment. Your doctor can conduct a thorough evaluation and recommend the most suitable course of action to address your sleep problems and enhance your overall well-being.

• Insomnia is a prevalent sleep disorder that can significantly impact an individual's quality of life and overall health.
• Symptoms of insomnia include difficulty falling asleep, staying asleep, or waking up too early.
• Causes of insomnia can range from stress and anxiety to underlying medical conditions and poor sleep habits.
• Home remedies for sleeplessness include establishing a consistent sleep schedule, creating a relaxing bedtime routine, and practising stress-reduction techniques.
• Insomnia treatment options may involve cognitive-behavioural therapy, medications, or a combination of both, depending on the severity and underlying causes of the disorder.
• Seeking professional help from a sleep specialist or healthcare provider is recommended for those struggling with persistent insomnia or experiencing significant daytime impairments due to sleep disturbances.