Understanding Insomnia

Almost everyone has a bad night now and then. Insomnia is different. It is a pattern of trouble falling asleep, staying asleep, or waking too early, even when you have the time and a decent place to sleep, and it leaves you feeling the effects the next day. It is the most common sleep complaint, and it is also very treatable.

What insomnia looks like

Insomnia can show up in several ways:

• Lying awake a long time before falling asleep
• Waking during the night and struggling to get back to sleep
• Waking much earlier than you planned and being unable to fall back asleep
• Feeling unrefreshed after a night in bed

Insomnia is also about the day after. Fatigue, poor concentration, irritability, low mood, and worry about sleep itself are all part of the picture. The American Academy of Sleep Medicine (AASM) notes that up to 35 percent of adults report insomnia symptoms. It is more common among older adults, women, people under stress, and people with conditions such as depression.

Short-term vs. chronic insomnia

Short-term (acute) insomnia usually follows something specific: a loss, a move, a new job, an illness, travel, or a stressful stretch at work. It may last a few days or weeks. Often it fades as life settles down.

Chronic insomnia is defined as sleep trouble that happens at least three nights a week and lasts at least three months. At that point, insomnia has often taken on a life of its own. The original trigger may be long gone, but habits and worries that grew up around poor sleep keep it going.

Common causes and contributors

Insomnia rarely has a single cause. Common contributors include:

• Stress and worry about work, money, health, or family
• Mental health conditions such as depression or anxiety
• Medical conditions that cause pain, breathing trouble, reflux, or frequent nighttime urination
• Other sleep disorders, including sleep apnea and restless legs syndrome
• Medicines and substances, including caffeine, nicotine, and alcohol (see how caffeine and alcohol affect sleep)
• Irregular schedules from shift work, frequent travel, or very different weekday and weekend routines
• The sleep environment: noise, light, an uncomfortable temperature, or a restless bed partner

When another condition is driving the insomnia, treating that condition matters. Insomnia that has become chronic often needs its own treatment as well.

CBT-I: the recommended first treatment

Cognitive behavioral therapy for insomnia, usually called CBT-I, is a structured program that targets the thoughts and habits that keep insomnia going. It is not general talk therapy. It is a practical, step-by-step approach, usually completed over a series of sessions spread across several weeks.

Two major medical organizations recommend it as the starting point:

• The American College of Physicians (2016) recommends CBT-I as the initial treatment for all adults with chronic insomnia.
• The AASM (2021) gives multicomponent CBT-I a strong recommendation for adults with chronic insomnia.

CBT-I usually combines several parts:

1. Sleep diary. You track your sleep so you and your provider can see real patterns rather than impressions.
2. Stimulus control. You rebuild the link between bed and sleep. That means going to bed only when sleepy and getting up if you can't sleep, then returning when drowsy.
3. Sleep restriction (sleep scheduling). Under guidance, you temporarily limit time in bed to match how much you are actually sleeping, which strengthens your sleep drive. Time in bed is then gradually extended.
4. Cognitive strategies. You learn to recognize and ease the worried, all-or-nothing thoughts that make nights harder.
5. Relaxation training. Breathing, muscle relaxation, and other calming techniques help quiet a busy body and mind.
6. Sleep education. Healthy habits around light, caffeine, alcohol, and routine round out the program.

Why sleep hygiene alone usually isn't enough

"Sleep hygiene" means healthy sleep habits: a regular schedule, a comfortable bedroom, cutting back on late caffeine, and winding down before bed. These habits are worthwhile, and our bedtime routine guide covers them.

For chronic insomnia, though, the AASM recommends against relying on sleep hygiene as the only treatment, because on its own it has been less effective than full CBT-I. Think of good habits as a foundation, not the whole house.

How to find CBT-I

CBT-I is offered by psychologists, physicians, nurses, and other clinicians with training in behavioral sleep medicine. It can be delivered in person, by video, or through structured online programs. Good places to start:

• Your primary care clinician, who can rule out other causes and refer you
• An accredited sleep center. The AASM keeps a directory of accredited sleep centers.
• The Society of Behavioral Sleep Medicine provider directory
• For veterans: VA's free, anonymous online course Path to Better Sleep at VeteranTraining.va.gov/insomnia covers the core parts of CBT-I. Veterans can also ask their VA care team about in-person or telehealth CBT-I. See our page for veterans and shift workers.

A note on medications

Prescription and over-the-counter sleep aids are an option for some people, but they come with tradeoffs. The AASM notes possible problems such as tolerance, next-day effects, falls, memory problems, and complex sleep behaviors such as sleepwalking. The American College of Physicians suggests a shared decision with your clinician about short-term medication when CBT-I alone hasn't been enough.

Please don't start, stop, or change any medicine or supplement for sleep without talking to your clinician or pharmacist, especially if you take other medicines.

Last reviewed and updated October 17, 2026. This article is for general education and isn't a substitute for advice from your own clinician. Read our medical disclaimer and editorial standards.