Sleep problems are common, especially during stressful periods. However, when difficulty falling asleep or staying asleep becomes frequent and begins to affect daytime functioning, it may indicate insomnia.

Insomnia is one of the most common sleep disorders. Studies suggest that up to one-third of adults report symptoms of insomnia, while a smaller proportion develop persistent sleep difficulties associated with daytime impairment.

Although insomnia may begin during periods of stress, illness, or life changes, it can persist even after the original trigger has resolved.

Understanding the causes of insomnia can help identify effective ways to improve sleep.

What Is Insomnia?

Insomnia is a sleep disorder characterized by difficulty:

• falling asleep

• staying asleep during the night

• waking earlier than intended

• obtaining restorative sleep

Importantly, insomnia occurs despite having enough time and opportunity to sleep and is usually accompanied by daytime symptoms such as fatigue, irritability, or difficulty concentrating.

For many people, insomnia occurs several nights per week and persists for weeks or months.

Common Symptoms of Insomnia

People experiencing insomnia may notice:

• Difficulty falling asleep at night

• Frequent awakenings during the night

• Waking too early and being unable to return to sleep

• Feeling unrefreshed after sleep

• Daytime fatigue or sleepiness

• Difficulty concentrating or remembering information

• Irritability or reduced emotional resilience

In clinical practice, these symptoms often lead people to seek help when they begin interfering with daily functioning.

Types of Insomnia

Sleep specialists often classify insomnia according to how long it lasts.

Short-Term Insomnia

Short-term insomnia typically lasts a few days to several weeks and is often linked to identifiable stressors such as illness, travel, or emotional distress.

Chronic Insomnia

Chronic insomnia is diagnosed when sleep problems occur at least three times per week for three months or longer and are associated with daytime impairment.

Without treatment, chronic insomnia may persist for years in some individuals.

Why Insomnia Happens?

Insomnia rarely has a single cause. In many cases, it develops through a combination of psychological, behavioural, and biological factors.

A commonly used framework is the 3-P model of insomnia, which describes three types of contributing factors.

Predisposing Factors

Some people may be naturally more vulnerable to insomnia due to factors such as:

• genetic predisposition

• personality traits such as high worry or emotional sensitivity

• female sex

• increasing age

Precipitating Factors

These factors trigger the initial sleep disturbance. Examples include:

• stressful life events

• illness or pain

• emotional distress

• shift work or irregular sleep schedules

Perpetuating Factors

Even after the original trigger resolves, certain habits can maintain insomnia. These include:

• irregular sleep schedules

• excessive time spent awake in bed

• daytime napping

• worry about not sleeping

These behaviours can unintentionally reinforce sleep difficulties over time.

How Insomnia Affects the Brain?

Sleep and wakefulness are regulated by complex networks in the brain involving several neurotransmitters and circadian mechanisms.

Key systems include:

• GABA, which promotes sleep

• Orexin, which promotes wakefulness

• Dopamine and norepinephrine, which support alertness

• Serotonin, which helps regulate sleep and mood

Research suggests that many individuals with chronic insomnia experience a state of physiological hyperarousal, meaning the brain remains excessively alert even during the night.

This heightened arousal can make it difficult for the brain to transition into sleep.

Insomnia and Mental Health

Sleep and mental health are closely connected.

Approximately 40% of people with insomnia also have a psychiatric condition, most commonly anxiety or depression.

In many cases, the relationship works in both directions:

• mental health conditions can disrupt sleep

• persistent insomnia can increase vulnerability to anxiety or depression

Addressing sleep problems often improves overall emotional wellbeing.

Potential Consequences of Chronic Insomnia

Persistent sleep deprivation can affect several areas of functioning.

Common consequences include:

• reduced concentration and memory

• irritability and emotional reactivity

• reduced productivity at work or school

• increased risk of accidents

Research suggests that individuals with insomnia may be two to four times more likely to experience accidents compared with good sleepers.

Over time, chronic sleep disturbance may also contribute to broader health problems.

Treatment Options for Insomnia

Effective treatment usually involves behavioural strategies and, in some cases, medication.

Cognitive Behavioural Therapy for Insomnia (CBT-I)

CBT-I is widely considered the first-line treatment for chronic insomnia.

It focuses on identifying and modifying behaviours and thoughts that interfere with sleep.

Common techniques include:

• stimulus control (reassociating the bed with sleep)

• sleep scheduling and sleep restriction

• relaxation techniques

• cognitive restructuring of sleep-related worries

CBT-I has been shown to produce sustained improvements in sleep quality.

Improving Sleep Habits (Sleep Hygiene)

Sleep hygiene refers to daily habits that support healthy sleep.

Helpful strategies include:

• maintaining a consistent sleep schedule

• limiting screen exposure before bedtime

• avoiding caffeine late in the day

• creating a comfortable and quiet sleep environment

While sleep hygiene alone may not resolve chronic insomnia, it provides an important foundation for healthy sleep.

Medication

In some cases, medications may be prescribed to provide short-term relief from severe sleep disturbance.

Common medications include:

• benzodiazepines

• non-benzodiazepine hypnotics

• melatonin receptor agonists

• orexin receptor antagonists

Medication should generally be used under medical supervision and alongside behavioural strategies.

When to Seek Professional Help

Occasional sleep difficulties are common. However, professional evaluation may be helpful if:

• sleep problems persist for several weeks or longer

• daytime functioning is significantly affected

• there are symptoms of anxiety or depression

• sleep medications are being used frequently without medical guidance

Early evaluation can help identify underlying causes and guide appropriate treatment.

Insomnia Self-Assessment

If you are unsure whether your sleep difficulties may indicate insomnia, you may consider completing a brief screening questionnaire.

Reviewed by Dr. Mahendra Singh Uikey
Consultant Psychiatrist | AIIMS-trained
Providing evidence-based psychiatric care

This article is for educational purposes and does not replace professional medical advice.

Common Questions About Insomnia

How many hours of sleep do adults need?

Most adults require 7–9 hours of sleep per night for optimal physical and mental functioning. Individual sleep needs may vary slightly, but consistently sleeping less than six hours can affect concentration, mood, and overall health.

What is the most common cause of insomnia?

Stress and psychological factors are among the most common triggers of insomnia. Work pressure, emotional distress, health concerns, and major life changes can activate the brain’s stress-response system, making it difficult to relax and fall asleep.

Can anxiety cause insomnia?

Yes. Anxiety can increase mental and physical arousal, making it difficult for the brain to transition into sleep. Racing thoughts, excessive worry, and heightened alertness often interfere with both falling asleep and staying asleep.

Can insomnia go away on its own?

Short-term insomnia often improves once the underlying stressor resolves. However, chronic insomnia may persist because certain behaviours—such as irregular sleep schedules or worrying about sleep—begin to maintain the problem.

What is the best treatment for chronic insomnia?

Cognitive Behavioural Therapy for Insomnia (CBT-I) is considered the first-line treatment for chronic insomnia. It helps individuals change behaviours and thought patterns that interfere with sleep and has been shown to produce long-lasting improvements.