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Sleep and mental health

Sleep disordersWhen sleep isn't rest: types of sleep disorders, their signs, and why each is treated differently

Reviewed by: Dr. Mahmoud El-Sawy Last updated: October 4, 2026 5 min read
The short answer

Sleep disorders are a group of conditions that disrupt the amount, quality or timing of sleep, leaving a person exhausted or sleepy during the day. The Cleveland Clinic notes that there are more than 80 types, the best known being chronic insomnia, obstructive sleep apnea, restless legs syndrome, narcolepsy and circadian rhythm disorders. Each type is treated differently, so treatment begins with diagnosis, not with sleeping pills.

  • Loud snoring with pauses in breathing and daytime sleepiness is a sign that needs checking.
  • Anxiety, depression and drugs are among the best-known causes of disrupted sleep.
  • Sleeping pills without a diagnosis can hide the problem or cause dependence.

"I sleep eight hours and wake up as if I hadn't slept, and my wife says I snore and breathe with difficulty." Not everyone who complains about sleep has insomnia. Some sleep enough hours but their sleep is broken, some are overcome by sleepiness at work, and others move or shout in their sleep. These are all different forms of what are called sleep disorders.

What Are Sleep Disorders?

The MedlinePlus encyclopedia describes sleep disorders as conditions that affect your ability to sleep well on a regular basis, whether through difficulty falling asleep, sleeping at the wrong times, sleeping too much, or abnormal behaviors during sleep. The Cleveland Clinic says the International Classification of Sleep Disorders (ICSD) includes more than 80 types, and that more than 50 million people in the United States alone have a sleep disorder.

The US National Heart, Lung, and Blood Institute (NHLBI) recommends that adults sleep 7 to 8 hours a day, while children and teenagers need more. But the number of hours alone is not enough; broken or unrefreshing sleep can leave the same effect as deprivation.

Types of Sleep Disorders

Chronic insomnia

Difficulty falling asleep or staying asleep on most nights for at least three months.

Obstructive sleep apnea

Snoring and episodes in which breathing stops during sleep, breaking it up.

Restless legs

An urgent need to move the legs at rest that prevents sleep.

Circadian rhythm disorder

Sleep timing delayed by two hours or more, or disrupted sleep because of shift work.

Narcolepsy

Inability to control when you sleep, with sudden, intense daytime sleepiness.

Behaviors during sleep

Such as acting out dreams with movement during REM (rapid eye movement) sleep, and sleepwalking.

Infographic, the best-known sleep disorders: chronic insomnia, obstructive sleep apnea, restless legs, circadian rhythm disorder, narcolepsy, behaviors during sleep
The most common types of sleep disorders as classified in medical references.

The best known of these types is chronic insomnia, which has its own page explaining its symptoms and treatment in detail.

Symptoms of Sleep Disorders

Symptoms vary by type, and signs mentioned by the Cleveland Clinic and the UK's National Health Service (NHS) include:

  • Regularly taking more than 30 minutes to fall asleep.
  • Waking often in the night and being unable to go back to sleep.
  • Loud snoring, or gasping and choking during sleep that the person sleeping beside you notices.
  • A feeling that you need to move your legs when you relax.
  • Severe daytime sleepiness despite sleeping enough hours.
  • Headache on waking, poor concentration and mood swings.

Sleep Apnea: The Disorder Many People Miss

According to the NHS, most symptoms of sleep apnea happen while the person is asleep, so only the person sleeping next to them may know: breathing stops and restarts, gasping or choking sounds, loud snoring, and frequent waking. During the day the patient feels severe tiredness, has difficulty concentrating, and suffers mood swings and morning headaches. The NHS stresses that it needs treatment because it can lead to more serious health problems.

Sleep Disorders and Mental Health

The relationship between sleep and the mind runs in both directions. Anxiety and depression are among the best-known causes of disrupted sleep, and repeated nightmares are a well-known sign in post-traumatic stress disorder (PTSD). In turn, sleep deprivation increases nervousness, poor concentration and mood swings. That is why a sleep disorder may be the first sign of a mental health problem that needs assessment.

Sleeping Pills, Drugs and Sleep Disorders

Many people turn to sleeping pills without a prescription, or to hashish and alcohol in order to sleep, and discover that their sleep has become dependent on the substance, and that stopping it brings back insomnia worse than before. Some common sleeping pills such as Z-drug sleep medications carry a risk of dependence if used for long periods without supervision. The page on insomnia and addiction explains this cycle and how to break it.

Habits That Improve Sleep

  1. Keep a fixed bedtime and wake time, even on days off.
  2. Avoid tea, coffee, soft drinks and smoking for three to four hours before bed, as the Cleveland Clinic advises.
  3. Cut down on long afternoon naps.
  4. Keep your phone and screens away from the bed.
  5. Make the bedroom quiet, dark and at a moderate temperature.
  6. If you don't fall asleep within a reasonable time, get up, do something calm, then go back.

When Should You See a Doctor About Sleep Disorders?

See a doctor if the sleep problem lasts for weeks despite improving your habits, if someone notices you stop breathing during sleep, if sleepiness overcomes you while driving or at work, or if you depend on a sleeping pill or a substance to sleep. You may need a chest physician, a neurologist or a sleep study, but if the sleep disorder is linked to anxiety, depression or substance use, a psychiatric assessment is essential. You can start with an assessment in Eradah's outpatient clinics, and the first consultation is free and confidential.

Frequently asked questions

Frequently asked questions about sleep disorders

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What Are Sleep Disorders?

Conditions that disrupt the amount, quality or timing of sleep and cause exhaustion and daytime sleepiness; there are more than 80 types.

What are the types of sleep disorders?

The best known are chronic insomnia, obstructive sleep apnea, restless legs, narcolepsy, circadian rhythm disorders, and abnormal behaviors during sleep.

How many hours of sleep does an adult need?

The US National Heart, Lung, and Blood Institute recommends that adults sleep 7 to 8 hours a day.

Are sleep disorders a mental illness?

Some are linked to anxiety, depression and trauma, and some have physical causes such as sleep apnea, so the specialty that treats them differs by type.

What are the symptoms of sleep apnea?

Loud snoring, breathing that stops and restarts, choking sounds and frequent waking, followed by daytime tiredness, sleepiness, headache and poor concentration.

Do sleeping pills treat sleep disorders?

They don't treat the cause, they can be dangerous in some types such as sleep apnea, and some cause dependence, so they should only be used with a diagnosis and medical supervision.

When should I see a doctor for sleep problems?

If the problem lasts for weeks, if someone notices that you stop breathing, if sleepiness overcomes you while driving, or if you have come to depend on a sleeping pill or a substance to sleep.

Medical reviewDr. Mahmoud El-Sawy, Consultant Psychiatrist and Addiction Specialist

This page was written by Eradah's editorial team and reviewed by a specialist doctor under the medical review policy. Last reviewed: October 4, 2026. The content is for awareness and does not replace a doctor's consultation.

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