Sleep disorders
Sleep disorders are problems with sleeping. These include trouble falling or staying asleep, falling asleep at the wrong times, too much sleep, and abnormal behaviors during sleep.
Causes
There are more than 100 different sleeping and waking disorders. They can be grouped into four main categories:
- Problems falling or staying asleep (insomnia)
- Problems staying awake (excessive daytime sleepiness)
- Problems sticking to a regular sleep schedule (sleep rhythm problem)
- Unusual behaviors during sleep (sleep-disruptive behaviors)
PROBLEMS FALLING AND STAYING ASLEEP
Insomnia includes trouble falling asleep or staying asleep. Episodes may come and go, last up to 3 weeks (be short-term), or be long-lasting (chronic).
PROBLEMS STAYING AWAKE
Hypersomnia is a condition in which people have excessive daytime sleepiness. This means they feel tired during the day and are prone to falling asleep. Hypersomnia can also include situations in which a person needs to sleep a lot. This may be due to other medical conditions, but can also be due to a problem in the brain. Causes of this problem include:
- Medical conditions, such as fibromyalgia and low thyroid function
Fibromyalgia
Fibromyalgia is a condition in which a person has long-term pain that is spread throughout their body. The pain is most often accompanied by fatigue...
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- Mononucleosis or other viral illnesses
- Narcolepsy and other sleep disorders
- Obesity, especially if it causes obstructive sleep apnea
Obstructive sleep apnea
Obstructive sleep apnea (OSA) is a problem in which your breathing pauses during sleep. This occurs because of narrowed or blocked airways.
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When no cause for the sleepiness can be found, it is called idiopathic hypersomnia.
PROBLEMS STICKING TO A REGULAR SLEEP SCHEDULE
Problems may also occur when you do not stick to a regular sleep and wake schedule. This occurs when people travel between time zones. It can also occur with shift workers who are on changing schedules, especially nighttime workers.
Disorders that involve a disrupted sleep schedule include:
- Irregular sleep-wake syndrome
- Jet lag syndrome
Jet lag syndrome
Jet lag is a sleep disorder caused by traveling across different time zones. Jet lag occurs when your body's biological clock is not set with the ti...
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- Delayed sleep phase, as in teenagers who go to sleep very late at night and then sleep until noon
- Advanced sleep phase, as in older adults who go to sleep early in the evening and wake up very early
Irregular sleep
Symptoms of irregular sleep/wake rhythm disorder include irregular periods of sleep and wakefulness which disrupt the normal daily sleep-wake cycle. It may be caused by brain dysfunction or not following a normal sleep schedule, ultimately leading to a pattern of insomnia and frequent daytime napping.
SLEEP-DISRUPTIVE BEHAVIORS
Abnormal behaviors during sleep are called parasomnias. They are fairly common in children and include:
- Sleep terrors
- Sleepwalking
- REM sleep-behavior disorder (a person moves during REM sleep and may act out dreams)
Reviewed By
Allen J. Blaivas, DO, Division of Pulmonary, Critical Care, and Sleep Medicine, VA New Jersey Health Care System, Clinical Assistant Professor, Rutgers New Jersey Medical School, East Orange, NJ. Review provided by VeriMed Healthcare Network. Internal review and update on 02/12/2024 by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
Avidan AY. Sleep and its disorders. In: Jankovic J, Mazziotta JC, Pomeroy SL, Newman NJ, eds. Bradley and Daroff's Neurology in Clinical Practice. 8th ed. Philadelphia, PA: Elsevier; 2022:chap 101.
Sateia MJ, Thorpy MJ. Classification of sleep disorders. In: Kryger M, Roth T, Goldstein CA, Dement WC, eds. Principles and Practice of Sleep Medicine. 7th ed. Philadelphia, PA: Elsevier; 2022:chap 69.
