What Is Insomnia? Symptoms, Causes, Treatment, and Medications

Insomnia can be triggered by stress, medical or mental health conditions, medications, and lifestyle or environmental factors. Often several causes overlap.

Psychological and Lifestyle Causes

• Stress, worry, or racing thoughts at night
• Anxiety, depression, or other mental health conditions
• Irregular sleep schedules, shift work, or jet lag
• Excess caffeine, nicotine, or alcohol, especially later in the day
• Screen use, light, or noise in the bedroom

Medical Causes

• Chronic pain conditions
• Acid reflux (GERD)
• Restless legs syndrome and sleep apnea
• Overactive thyroid and other hormonal changes
• Menopause-related hot flashes

Medication-Related Causes

Certain medications can disrupt sleep. Examples include:

• Some antidepressants
• Corticosteroids
• Certain blood pressure medications (such as beta blockers)
• Stimulants and some decongestants

Note: Do not stop a prescribed medication because of sleep problems without talking to your doctor, who can adjust timing or suggest alternatives. Insomnia also becomes more common with age.

The core symptom is difficulty sleeping despite having the opportunity, along with daytime consequences.

Common symptoms include:

• Trouble falling asleep at night
• Waking up during the night and struggling to fall back asleep
• Waking up too early
• Not feeling rested after sleep
• Daytime tiredness or sleepiness
• Irritability, anxiety, or low mood
• Difficulty paying attention, focusing, or remembering
• Increased errors or accidents

How Long Does Insomnia Typically Last?

Duration helps classify insomnia:

• Acute (short-term) insomnia: days to a few weeks, often tied to stress or a specific event
• Chronic insomnia: occurs at least three nights per week for three months or longer
• Insomnia linked to another condition: may persist until the underlying issue is addressed

If poor sleep is affecting your daytime functioning or lasting more than a few weeks, talk with a healthcare provider.

Insomnia is usually diagnosed based on your symptoms, sleep history, and medical history. There is no single lab test; the goal is to confirm the pattern and identify any underlying causes.

A healthcare provider may ask:

• How long has your sleep been a problem, and how many nights a week?
• Do you have trouble falling asleep, staying asleep, or both?
• What is your typical bedtime routine and sleep environment?
• How much caffeine, alcohol, or nicotine do you use, and when?
• What medications and supplements do you take?
• Do you snore, gasp, or have restless legs at night?

Tools and tests may include:

• A sleep diary kept for one to two weeks
• Questionnaires about sleep quality and daytime sleepiness
• Actigraphy (a wrist device that tracks activity and rest)
• A sleep study (polysomnography) if sleep apnea or another sleep disorder is suspected
• Blood tests to check for thyroid or other medical contributors

Identifying conditions such as sleep apnea or restless legs syndrome is important because they need their own treatment.

Treatment starts with behavioral approaches and good sleep habits, adding medication when needed. Addressing underlying causes is key.

Cognitive Behavioral Therapy for Insomnia (CBT-I)

CBT-I is the recommended first-line treatment for chronic insomnia. It is a structured, multicomponent program that includes sleep education, stimulus control, sleep restriction, relaxation techniques, and changing unhelpful thoughts about sleep. Unlike medication, its benefits tend to last after treatment ends.

Prescription Medications

When medication is appropriate, options include:

• Nonbenzodiazepine Z-drugs - zolpidem and eszopiclone for sleep onset and maintenance; zaleplon mainly for falling asleep
• Melatonin receptor agonist - ramelteon, which targets sleep onset and has low abuse potential
• Low-dose doxepin - a sedating antidepressant used at low doses for sleep maintenance
• Dual orexin receptor antagonists (DORAs) - suvorexant, lemborexant, and daridorexant (Quviviq), which block wake-promoting orexin signaling
• Benzodiazepines - occasionally used short term but generally avoided long term due to dependence risk

Good Sleep Habits (Sleep Hygiene)

• Keep a consistent sleep and wake schedule, even on weekends
• Make the bedroom dark, quiet, cool, and comfortable
• Limit caffeine, alcohol, and large meals before bed
• Avoid screens and bright light near bedtime
• Get out of bed if you cannot sleep after about 20 minutes, and return when sleepy

Sleep medications work best alongside CBT-I and healthy sleep habits, and are generally intended for the shortest effective duration.

Ongoing insomnia does more than make you tired. Poor sleep can affect mental health, physical health, and safety.

Possible complications include:

• Daytime fatigue and low energy
• Difficulty concentrating, remembering, and making decisions
• Higher risk of anxiety and depression
• Irritability and strained relationships
• Reduced work or school performance
• Greater risk of car crashes and other accidents from drowsiness
• Increased risk of conditions such as high blood pressure and heart disease with long-term poor sleep

Some sleep medications can cause next-day drowsiness or, rarely, complex sleep behaviors such as sleep-driving. Follow dosing instructions and tell your doctor about any unusual effects.

Many cases of insomnia can be prevented or reduced with consistent sleep habits and stress management.

Practical prevention tips:

• Go to bed and wake up at the same times every day
• Create a relaxing wind-down routine before bed
• Limit caffeine after midday and avoid nicotine and heavy alcohol use
• Keep the bedroom cool, dark, and quiet, and reserve it for sleep
• Get regular daytime physical activity, but not too close to bedtime
• Manage stress with relaxation, mindfulness, or talking with a professional
• Avoid long or late-afternoon naps
• Limit screen time and bright light in the hour before bed

If sleep problems persist despite these steps, consider CBT-I, which teaches durable skills for better sleep.

Occasional sleepless nights are normal, but see a healthcare provider when insomnia is frequent, lasting, or affecting your daily life.

Seek medical care if you experience:

• Trouble sleeping at least three nights a week for three months or more
• Daytime fatigue, mood changes, or difficulty functioning
• Falling asleep during the day or while driving
• Loud snoring, gasping, or pauses in breathing during sleep (possible sleep apnea)
• Insomnia along with depression, anxiety, or thoughts of self-harm
• Reliance on alcohol or over-the-counter sleep aids to fall asleep

A provider can look for underlying causes, recommend CBT-I, and discuss whether medication is appropriate for you.

Over-the-counter sleep aids can help with occasional sleeplessness, but prescription options and CBT-I are used for chronic or more severe insomnia.

Common OTC options (for short-term or occasional use):

• Melatonin - a supplement that may help with sleep timing, especially for jet lag or shift work
• Diphenhydramine (Benadryl) and doxylamine - sedating antihistamines found in many nighttime sleep aids

OTC sleep aids are not meant for long-term nightly use, and antihistamines can cause next-day grogginess, especially in older adults.

See a doctor for prescription treatment if:

• Your insomnia is chronic (three or more nights a week for three months or longer)
• OTC aids are not working or you are using them nightly
• Insomnia is linked to another condition such as depression, chronic pain, or sleep apnea

Prescription medications include zolpidem, eszopiclone, ramelteon, low-dose doxepin, and dual orexin receptor antagonists such as suvorexant, lemborexant, and daridorexant (Quviviq). Your doctor will choose based on whether you struggle to fall asleep, stay asleep, or both, and on your other health conditions.