Insomnia

Overview

Insomnia is a sleep disorder characterized by difficulty falling asleep, staying asleep, or waking up too early. People often describe it as lying in bed with a mind that won’t shut off, or consistently waking up in the early morning and not being able to go back to sleep. 

Insomnia isn’t only an occasional sleepless night—it encompasses persistent sleep problems accompanied by low energy, fatigue, irritability, and brain fog during the day. These symptoms can be short term, lasting a handful of days to weeks (especially when tied to stress) or chronic, meaning they happen for at least three nights per week for three months or more.

Insomnia may occur on its own, but it often develops alongside other factors such as stress, anxiety, depression, chronic pain, medications, substance use, circadian rhythm disruption, or another sleep disorder such as sleep apnea. Healthcare providers look for these contributing factors because treating them can improve sleep.

While anyone can experience insomnia, some groups are more vulnerable, including:

• Adults: Adults experience lighter, more fragmented sleep as they age. 
• Women: Extensive hormonal shifts that can occur over a woman’s lifetime, like those during pregnancy or menopause, are known to disrupt sleep.
• People with irregular schedules: Shift workers or those with unpredictable or rotating schedules may also be more prone to insomnia.
• People with medical or mental health conditions: Anxiety, depression, chronic pain, and long-term illnesses like heart disease, can contribute to an increased risk of insomnia.

What causes insomnia?

A mix of triggers and habits that keep the brain from winding down causes insomnia. The most common drivers of the condition include:

• Stress and an overactive mind: Our brains evolved to stay alert when something feels important or threatening. Whether it’s a big life event, like the birth of a child or the death of a loved one, or smaller life to-dos, stress can keep your nervous system in ready mode and make it harder to fall asleep.
• Conditioned wakefulness: Over time, your brain can start to associate your bed with being awake. If you’ve spent many nights tossing and turning, your brain learns that your bed equals frustration rather than sleep.
• Poor sleep habits: An inconsistent bedtime, late-night screen use, eating too close to bedtime, caffeine late in the day, or long naps can throw off your internal clock and make sleep more elusive. Noise levels, light, and room temperature are also important considerations.
• Your internal clock is off: If your body clock, or circadian rhythm, is misaligned due to shift work, jet lag, or irregular sleep schedules, you may feel awake when you want to sleep and sleepy when you should be awake.
• Genetics: Research has shown that insomnia may run in families, and if a parent struggles with sleep, their children are also more likely to struggle. Rather than one single gene that produces insomnia, it’s multiple small genetic influences, like sleep-wake timing, brain signaling, and stress hormones. 
• Mental health dynamics: Conditions like anxiety and depression are intricately linked to insomnia, as they tend to accelerate symptoms of insomnia—poor sleep often worsens overall mood, and mood issues tend to worsen sleep.
• Temporary illnesses: Temporary illnesses, discomfort, medications, and stress around being sick can temporarily disrupt sleep.
• Medical conditions: Chronic pain, other sleep disorders like sleep apnea, and medical conditions like Parkinson’s disease, Alzheimer’s disease, cancer, and heart disease are all conditions that affect sleep.

Insomnia and Women 

Women are more likely than men to experience insomnia, in part because hormonal changes during menstrual cycles, pregnancy, perimenopause, and menopause can disrupt sleep.

Not only do the hormones estrogen and progesterone influence sleep, body temperature, and brain chemistry, but they also fluctuate dramatically throughout a woman’s lifetime during pregnancy, perimenopause, and menopause. 

Women also demonstrate marked differences in sleep architecture. On average, they get slightly more deep sleep than men, but they report more awakenings and lighter, fragmented sleep. Conditions like anxiety and depression, which are more commonly diagnosed in women, are strongly linked to insomnia. Additionally, some conditions, like fibromyalgia, as well as restless legs syndrome, are more common in women. 

You may experience insomnia symptoms in a multitude of ways, including:

• Daytime fatigue or low energy: Feeling drained, sluggish, or like you’re running on empty, even after what may have been enough time in bed, is common.
• Daytime sleepiness: You might be sleepy or drowsy during the day, although sleep doesn’t come easily when you try to nap or go to bed.
• Brain fog: Your thoughts could feel slower or fuzzier, with difficulty focusing, following conversations, or staying on task.
• Memory issues: You might forget small things or details more often, like where you put something or what you were about to do. 
• Feeling “wired but tired”: As a hallmark symptom, your body may feel exhausted while your mind still feels hyperalert or restless.
• Headaches or physical tension: Tension headaches or neck and shoulder tightness often accompany poor sleep.
• Irritability or mood swings: Little things may start to feel more frustrating, and you may feel short tempered, easily annoyed, or emotionally on edge.
• Increased anxiety: Sleep loss can make your mind race more during the day, amplifying overall worry and tension.
• Sleep anxiety: This looks like dreading bedtime and stressing about whether you’ll sleep, which can worsen insomnia.
• Low mood or depressive feelings: Feelings of being down, unmotivated, or less interested in things you normally enjoy may occur. 
• Clumsiness or slower reaction time: Feeling less coordinated or slower to react can also occur due to sleep deprivation.
• Reduced performance: Tasks at work, school, or home can take longer. You might make more mistakes and be less productive.
• Feeling unrefreshed after sleep: Even if you do sleep for several hours, it doesn’t feel restorative, as though your body wasn’t able to fully recharge.

Less obvious symptoms of insomnia that often fly under the radar or may be blamed on other things can include:

• Digestive changes: Consistent sleep disruption can affect the entire body, leading to digestive symptoms like mild stomach upset, appetite changes, or irregular digestion.
• Increased sensitivity to pain: Aches and pain can feel more intense or harder to tolerate when you’re not sleeping well.
• More frequent mistakes or minor accidents: Whether it’s small errors or bigger lapses in attention, lack of sleep increases the risk of small errors, missed details, or lapses in attention that can add up over time.

It’s crucial to remember that sleep isn’t only rest; it’s active maintenance for your brain and body. Constant disruptions to this restorative phase can cause the effects on your brain and body to accumulate.

Insomnia Diagnosis

Diagnosing insomnia is like piecing together a puzzle based on your symptoms, sleep habits, and occasionally, some data. Sleep specialists typically look for the following:

• Trouble falling asleep, staying asleep, or waking too early
• Occurring at least three nights per week
• Lasting at least three months in the case of chronic insomnia, and
• Happening even when you have enough opportunity to sleep

Additionally, your doctor might use the following exams, tests, and studies to diagnose insomnia:

• Medical history and physical exam: Your provider will ask about your sleep schedule, how long it takes you to fall asleep, how often you wake up, whether you feel rested, and how symptoms affect your day. They may also review your medications, caffeine/alcohol/nicotine use, medical history, and signs of other sleep disorders such as sleep apnea. A neurological exam may be performed if symptoms suggest a neurologic condition affecting sleep.
• Sleep diary and symptom logs: Your doctor will likely ask you to keep a daily log of sleep and wake times for at least one week, recording when you go to bed, when you fall asleep, when you wake, possible triggers, stress levels, medications or substances used, and any naps you take. This detailed tracking can help your provider spot patterns that will support an insomnia diagnosis.
• Screening for underlying causes: Because insomnia is often connected to other issues, your provider will look for contributing factors like stress, anxiety, or depression, as well as medical conditions and medications that may disrupt your sleep. Some conditions can look like insomnia but are actually separate conditions, such as sleep apnea, circadian rhythm disorders, or restless legs syndrome.
• Questionnaires: Standardized surveys, like the Insomnia Severity Index (ISI) or the Epworth Sleepiness Scale, can help quantify the severity of your symptoms and track improvement over time.
• Overnight sleep study: Insomnia itself usually does not require an overnight sleep study. Your provider may recommend one if they suspect another sleep disorder, such as sleep apnea, periodic limb movement disorder, narcolepsy, or another condition that could be disrupting sleep.
• Actigraphy: Actigraphy uses a watch-like device worn on the wrist to track your movements and light exposure. It also continuously records your sleep-wake activity for days or weeks to provide an objective view of your circadian rhythm. 

The goal with an insomnia diagnosis is to understand why your sleep isn’t working, not just confirm that it isn’t. Once your healthcare provider can understand what’s driving it, the condition becomes highly treatable. Insomnia is highly treatable for many people, especially when contributing factors are identified.

Treatments for insomnia can include: 

• Cognitive Behavioral Therapy for Insomnia (CBT-I): As the most effective, first-line treatment for chronic insomnia, CBT-I focuses on two factors: changing habits that inadvertently keep insomnia going, and changing thoughts and reactions that make sleep feel stressful or out of reach. This structured program, typically between six and eight sessions, addresses the root cause of insomnia rather than simply masking symptoms.
  • CBT-I addresses the behaviors, thoughts, and conditioned arousal that can keep insomnia going. One core technique is sleep restriction, which temporarily limits time in bed to better match the amount of time a person is actually sleeping. In some cases, clinicians use sleep compression, a more gradual version of this approach.
  • Another key component is stimulus control, or retraining your brain to associate your bed with sleep rather than wakefulness or frustration. That usually means going to bed only when you’re sleepy, getting out of bed if you can’t sleep after a while, and avoiding things like scrolling or working in bed. 
• Digital or app-based CBT-I programs: For greater accessibility, structured, self-guided versions of CBT-I completed digitally or through an app can offer exercises and strategies, guide you through sleep tracking, and adjust recommendations based on your progress.
• Medications: Medications may help some people fall asleep or stay asleep, especially during short-term insomnia or while starting other treatments. Options may include prescription sleep medications such as zolpidem, zaleplon, eszopiclone, ramelteon, suvorexant or related orexin receptor antagonists, low-dose doxepin, and, in selected cases, benzodiazepines. Some medications used for other conditions, such as certain antidepressants, may be prescribed off-label when appropriate. Because sleep medications can cause side effects, interact with other medicines, lose effectiveness over time, or be habit-forming, they should be used with careful guidance from a healthcare provider. Melatonin is a supplement and may help some circadian-rhythm problems, but it is not considered a proven treatment for chronic insomnia.
• Sleep hygiene habits: Efforts to improve sleep hygiene are most effective when combined with CBT-I. These strategies can include keeping a consistent sleep and wake time, limiting caffeine (especially in the afternoon and evening), reducing screen use before bed, and creating a cool, dark, and quiet sleep environment.
• Relaxation and stress-reduction techniques: Each of these techniques can help calm your nervous system and make it easier to relax, especially if your mind races at night. Examples include deep breathing exercises, progressive muscle relaxation, meditation or mindfulness, and guided imagery. 
• Circadian rhythm support: If your internal clock is out of sync, realigning your body clock so you feel sleepy at the right time is essential. Circadian rhythm support can include getting bright light at the right time of day, strategically using melatonin, and gradually adjusting your sleep and wake times.

With treatment,sleep ideally begins to improve over weeks to a few months. Falling asleep and staying asleep become easier, and daytime symptoms begin to fade as your confidence in sleep builds. If another condition is contributing to your insomnia, like anxiety, depression, chronic pain, or sleep apnea, addressing it is crucial—sleep often improves when the root issue improves.

For many people, insomnia is a treatable pattern that can improve with the right approach.