Sleep disorder












Sleep disorder
Pediatric polysomnogram.jpg
Pediatric polysomnography
Specialty
Psychiatry, Sleep medicine, Neurology

A sleep disorder, or somnipathy, is a medical disorder of the sleep patterns of a person or animal. Some sleep disorders are serious enough to interfere with normal physical, mental, social and emotional functioning. Polysomnography and actigraphy are tests commonly ordered for some sleep disorders.


Disruptions in sleep can be caused by a variety of issues, from teeth grinding (bruxism) to night terrors. When a person suffers from difficulty falling asleep and/or staying asleep with no obvious cause, it is referred to as insomnia.[1]


Sleep disorders are broadly classified into dyssomnias, parasomnias, circadian rhythm sleep disorders involving the timing of sleep, and other disorders including ones caused by medical or psychological conditions and sleeping sickness.


Some common sleep disorders include sleep apnea (stops in breathing during sleep), narcolepsy and hypersomnia (excessive sleepiness at inappropriate times), cataplexy (sudden and transient loss of muscle tone while awake), and sleeping sickness (disruption of sleep cycle due to infection). Other disorders include sleepwalking, night terrors and bed wetting. Management of sleep disturbances that are secondary to mental, medical, or substance abuse disorders should focus on the underlying conditions.


Sleep disorders are most common in men and women over the age of 65. About half of the people claim to have some sleep problem at one point. It is most common in the elderly because of multiple factors. Factors include medicine, Aging in general, and pre diagnosed physiological problems and stress.




Contents






  • 1 Common disorders


    • 1.1 Types




  • 2 Risks


  • 3 Treatment


    • 3.1 Allergy treatment


    • 3.2 Acupuncture


    • 3.3 Hypnosis


    • 3.4 Music therapy


    • 3.5 Melatonin




  • 4 Sleep medicine


  • 5 Epidemiology


    • 5.1 Children and Young Adults


    • 5.2 Insomnia


    • 5.3 Obstructive Sleep Apnea


    • 5.4 Sleep Paralysis


    • 5.5 Restless Leg Syndrome




  • 6 See also


  • 7 References


  • 8 External links





Common disorders


The most common sleep disorders include:




  • Bruxism, involuntarily grinding or clenching of the teeth while sleeping.


  • Catathrenia, nocturnal groaning during prolonged exhalation.


  • Delayed sleep phase disorder (DSPD), inability to awaken and fall asleep at socially acceptable times but no problem with sleep maintenance, a disorder of circadian rhythms. Other such disorders are advanced sleep phase disorder (ASPD), non-24-hour sleep–wake disorder (non-24) in the sighted or in the blind, and irregular sleep wake rhythm, all much less common than DSPD, as well as the situational shift work sleep disorder.[2]


  • Hypopnea syndrome, abnormally shallow breathing or slow respiratory rate while sleeping.


  • Idiopathic hypersomnia, a primary, neurologic cause of long-sleeping, sharing many similarities with narcolepsy.


  • Insomnia disorder (primary insomnia), chronic difficulty in falling asleep and/or maintaining sleep when no other cause is found for these symptoms. Insomnia can also be comorbid with or secondary to other disorders.


  • Kleine–Levin syndrome, a rare disorder characterized by persistent episodic hypersomnia and cognitive or mood changes.[3]


  • Narcolepsy, including excessive daytime sleepiness (EDS), often culminating in falling asleep spontaneously but unwillingly at inappropriate times. About 70% of those who have narcolepsy also have cataplexy, a sudden weakness in the motor muscles that can result in collapse to the floor while retaining full conscious awareness.[4]


  • Night terror, Pavor nocturnus, sleep terror disorder, an abrupt awakening from sleep with behavior consistent with terror.[5]


  • Nocturia, a frequent need to get up and urinate at night. It differs from enuresis, or bed-wetting, in which the person does not arouse from sleep, but the bladder nevertheless empties.[6]


  • Parasomnias, disruptive sleep-related events involving inappropriate actions during sleep, for example sleep walking, night-terrors and catathrenia.


  • Periodic limb movement disorder (PLMD), sudden involuntary movement of arms and/or legs during sleep, for example kicking the legs. Also known as nocturnal myoclonus. See also Hypnic jerk, which is not a disorder.


  • Rapid eye movement sleep behavior disorder (RBD), acting out violent or dramatic dreams while in REM sleep, sometimes injuring bed partner or self (REM sleep disorder or RSD).[7]


  • Restless legs syndrome (RLS), an irresistible urge to move legs. RLS sufferers often also have PLMD.


  • Shift work sleep disorder (SWSD), a situational circadian rhythm sleep disorder. (Jet lag was previously included as a situational circadian rhythm sleep disorder, but it doesn't appear in DSM-5 (see Diagnostic and Statistical Manual of Mental Disorders)).


  • Sleep apnea, obstructive sleep apnea, obstruction of the airway during sleep, causing lack of sufficient deep sleep, often accompanied by snoring. Other forms of sleep apnea are less common.[8] Obstructive sleep apnea (OSA) is a medical disorder that is caused by repetitive collapse of the upper airway (back of the throat) during sleep. For the purposes of sleep studies, episodes of full upper airway collapse for at least ten seconds are called apneas[9]


  • Sleep paralysis, characterized by temporary paralysis of the body shortly before or after sleep. Sleep paralysis may be accompanied by visual, auditory or tactile hallucinations. Not a disorder unless severe. Often seen as part of narcolepsy.


  • Sleepwalking or somnambulism, engaging in activities normally associated with wakefulness (such as eating or dressing), which may include walking, without the conscious knowledge of the subject.


  • Somniphobia, one cause of sleep deprivation, a dread/ fear of falling asleep or going to bed. Signs of the illness include anxiety and panic attacks before and during attempts to sleep.



Types




  • Dyssomnias – A broad category of sleep disorders characterized by either hypersomnia or insomnia. The three major subcategories include intrinsic (i.e., arising from within the body), extrinsic (secondary to environmental conditions or various pathologic conditions), and disturbances of circadian rhythm.[10]


    • Insomnia: Insomnia may be primary or it may be comorbid with or secondary to another disorder such as a mood disorder (i.e., emotional stress, anxiety, depression) or underlying health condition (i.e., asthma, diabetes, heart disease, pregnancy or neurological conditions).[11]

    • Primary hypersomnia. Hypersomnia of central or brain origin.


      • Narcolepsy: A chronic neurological disorder (or dyssomnia), which is caused by the brain's inability to control sleep and wakefulness.[12]


      • Idiopathic hypersomnia: a chronic neurological disease similar to narcolepsy in which there is an increased amount of fatigue and sleep during the day. Patients who suffer from idiopathic hypersomnia cannot obtain a healthy amount of sleep for a regular day of activities. This hinders the patients' ability to perform well, and patients have to deal with this for the rest of their lives.[13]

      • Recurrent hypersomnia – including Kleine–Levin syndrome

      • Posttraumatic hypersomnia

      • Menstrual-related hypersomnia




    • Sleep disordered breathing (SDB), including (non exhaustive):

      • Several types of Sleep apnea

      • Snoring

      • Upper airway resistance syndrome



    • Restless leg syndrome

    • Periodic limb movement disorder




  • Circadian rhythm sleep disorders

    • Delayed sleep phase disorder

    • Advanced sleep phase disorder

    • Non-24-hour sleep–wake disorder




  • Parasomnias – A category of sleep disorders that involve abnormal and unnatural movements, behaviors, emotions, perceptions, and dreams in connection with sleep.


    • Bedwetting or sleep enuresis


    • Bruxism (Tooth-grinding)


    • Catathrenia – nocturnal groaning


    • Exploding head syndrome – Waking up in the night hearing loud noises.


    • Sleep terror (or Pavor nocturnus)- Characterized by a sudden arousal from deep sleep with a scream or cry, accompanied by some behavioral manifestations of intense fear.[14]

    • REM sleep behaviour disorder


    • Sleepwalking (or somnambulism)


    • Sleep talking (or somniloquy)


    • Sleep sex (or sexsomnia)



  • Medical or psychiatric conditions that may produce sleep disorders

    • 22q11.2 deletion syndrome

    • Alcoholism


    • Mood disorders
      • Depression


    • Anxiety disorder

    • Panic


    • Psychosis (such as Schizophrenia)




  • Sleeping sickness – a parasitic disease which can be transmitted by the Tsetse fly.



Risks


A systematic review found that traumatic childhood experiences (such as family conflict or sexual trauma) significantly increases the risk for a number of sleep disorders in adulthood, including sleep apnea, narcolepsy, and insomnia.[15] It is currently unclear whether or not moderate alcohol consumption increases the risk of obstructive sleep apnea.[16]


In addition, an evidence-based synopses suggests that the sleep disorder, idiopathic REM sleep behavior disorder (iRBD), may have a hereditary component to it. A total of 632 participants, half with iRBD and half without, completed self-report questionnaires. The results of the study suggest that people with iRBD are more likely to report having a first-degree relative with the same sleep disorder than people of the same age and sex that do not have the disorder.[17] More research needs to be conducted to gain further information about the hereditary nature of sleep disorders.


A population susceptible to the development of sleep disorders is people who have experienced a traumatic brain injury (TBI). Because many researchers have focused on this issue, a systematic review was conducted to synthesize their findings. According to their results, TBI individuals are most disproportionately at risk for developing narcolepsy, obstructive sleep apnea, excessive daytime sleepiness, and insomnia.[18] The study's complete findings can be found in the table below:






























































































































































































Source of data
Sleep variable
Community
TBI
Community
TBI
Sleep category

Nparticipants

Nparticipants

P

P
Z

prob
Healthy controls
Sleep disturbance
Overall
66
85
.32
.56
3.02
.003
Sleep problem
Sleep initiation
77
77
.05
.41
5.33
<.001
Excessive daytime sleepiness
85
99
.10
.24
2.65
.008

Community samples
Sleep disturbance
Overall
2187
1706
.41
.50
5.59
<.001
Sleep disorders
Insomnia
1007
581
.10
.29
9.94
<.001
Hypersomnia
7954
212
.10
.28
8.38
<.001
Obstructive sleep apnoea
1741
283
.02
.25
15.51
<.001
Periodic limb movements
18,980
212
.04
.08
2.95
.003
Narcolepsy
18,980
152
.00b
.04
17.11
<.001
Sleep problem
Snoring
2629
65
.42
.60
3.56
<.001
Insomnia
6340
1001
.31
.50
11.8
<.001
Sleep maintenance
24,600
309
.27
.50
8.96
<.001
Sleep efficiency
1007
119
.27
.49
4.93
<.001
Sleep initiation
24,600
368
.27
.36
3.80
<.001
Nightmares
2187
133
.08
.27
7.43
<.001
Excessive daytime sleepiness
16,583
651
.09
.27
15.27
<.001
Early morning awakening
24,600
364
.18
.38
9.76
<.001
Sleep walking
4972
99
.02
.09
4.85
<.001


Treatment




Sign with text: Sömnförsök pågår (Sleep study in progress), room for sleep studies in NÄL hospital, Sweden.


Treatments for sleep disorders generally can be grouped into four categories:




  • Behavioral and psychotherapeutic treatment

  • Rehabilitation and management

  • Medication

  • Other somatic treatment


None of these general approaches is sufficient for all patients with sleep disorders. Rather, the choice of a specific treatment depends on the patient's diagnosis, medical and psychiatric history, and preferences, as well as the expertise of the treating clinician. Often, behavioral/psychotherapeutic and pharmacological approaches are not incompatible and can effectively be combined to maximize therapeutic benefits. Management of sleep disturbances that are secondary to mental, medical, or substance abuse disorders should focus on the underlying conditions.


Medications and somatic treatments may provide the most rapid symptomatic relief from some sleep disturbances. Certain disorders like narcolepsy, are best treated with prescription drugs such as modafinil.[13] Others, such as chronic and primary insomnia, may be more amenable to behavioral interventions, with more durable results.


Chronic sleep disorders in childhood, which affect some 70% of children with developmental or psychological disorders, are under-reported and under-treated. Sleep-phase disruption is also common among adolescents, whose school schedules are often incompatible with their natural circadian rhythm. Effective treatment begins with careful diagnosis using sleep diaries and perhaps sleep studies. Modifications in sleep hygiene may resolve the problem, but medical treatment is often warranted.[19]


Special equipment may be required for treatment of several disorders such as obstructive apnea, the circadian rhythm disorders and bruxism. In these cases, when severe, an acceptance of living with the disorder, however well managed, is often necessary.


Some sleep disorders have been found to compromise glucose metabolism.[20]



Allergy treatment


Histamine plays a role in wakefulness in the brain. An allergic reaction over produces histamine causing wakefulness and inhibiting sleep[21] Sleep problems are common in people with allergic rhinitis. A study from the N.I.H. found that sleep is dramatically impaired by allergic symptoms and that the degree of impairment is related to the severity of those symptoms [1]s[22] Treatment of allergies has also been shown to help sleep apnea.[23]



Acupuncture


A review of the evidence in 2012 concluded that current research is not rigorous enough to make recommendations around the use of acupuncture for insomnia.[24] The pooled results of two trials on acupuncture showed a moderate likelihood that there may be some improvement to sleep quality for individuals with a diagnosis insomnia.[24]:15 This form of treatment for sleep disorders is generally studied in adults, rather than children. Further research would be needed to study the effects of acupuncture on sleep disorders in children.



Hypnosis


Research suggests that hypnosis may be helpful in alleviating some types and manifestations of sleep disorders in some patients.[25] "Acute and chronic insomnia often respond to relaxation and hypnotherapy approaches, along with sleep hygiene instructions."[26]Hypnotherapy has also helped with nightmares and sleep terrors. There are several reports of successful use of hypnotherapy for parasomnias[27][28] specifically for head and body rocking, bedwetting and sleepwalking.[29]


Hypnotherapy has been studied in the treatment of sleep disorders in both adults[29] and children.[30]



Music therapy


Although more research should be done to increase the reliability of this method of treatment, research suggests that music therapy can improve sleep quality in acute and chronic sleep disorders. In one particular study, participants (18 years or older) who had experienced acute or chronic sleep disorders were put in a randomly controlled trial and their sleep efficiency (overall time asleep) was observed. In order to assess sleep quality, researchers used subjective measures (i.e. questionnaires) and objective measures (i.e. polysomnography). The results of the study suggest that music therapy did improve sleep quality in subjects with acute or chronic sleep disorders, however only when tested subjectively. Although these results are not fully conclusive and more research should be conducted, it still provides evidence that music therapy can be an effective treatment for sleep disorders.[31]


In another study, specifically looking to help people with insomnia, similar results were seen. The participants that listened to music experienced better sleep quality than those who did not listen to music.[32]



Melatonin


In addressing sleep disorders and possible solutions, there is often a lot of buzz surrounding melatonin. Research suggests that melatonin is useful in helping people to fall asleep faster (decreased sleep latency), to stay asleep longer, and to experience improved sleep quality. In order to test this, a study was conducted that compared subjects that had taken Melatonin to subjects that had taken a placebo pill in subjects with primary sleep disorders. Researchers assessed sleep onset latency, total minutes slept, and overall sleep quality in the Melatonin and placebo groups to note the differences. In the end, researchers found that melatonin decreased sleep onset latency, increased total sleep time, and improved quality of sleep significantly more than the placebo group.[33][34]



Sleep medicine



Due to rapidly increasing knowledge about sleep in the 20th century, including the discovery of REM sleep in the 1950s and circadian rhythm disorders in the 70s and 80s, the medical importance of sleep was recognized. The medical community began paying more attention than previously to primary sleep disorders, such as sleep apnea, as well as the role and quality of sleep in other conditions. By the 1970s in the USA, clinics and laboratories devoted to the study of sleep and sleep disorders had been founded, and a need for standards arose.



Specialists in Sleep Medicine were originally certified by the American Board of Sleep Medicine, which still recognizes specialists. Those passing the Sleep Medicine Specialty Exam received the designation "diplomate of the ABSM." Sleep Medicine is now a recognized subspecialty within internal medicine, family medicine, pediatrics, otolaryngology, psychiatry and neurology in the United States. Certification in Sleep Medicine shows that the specialist:


"has demonstrated expertise in the diagnosis and management of clinical conditions that occur during sleep, that disturb sleep, or that are affected by disturbances in the wake-sleep cycle. This specialist is skilled in the analysis and interpretation of comprehensive polysomnography, and well-versed in emerging research and management of a sleep laboratory."[35]


Competence in sleep medicine requires an understanding of a myriad of very diverse disorders, many of which present with similar symptoms such as excessive daytime sleepiness, which, in the absence of volitional sleep deprivation, "is almost inevitably caused by an identifiable and treatable sleep disorder", such as sleep apnea, narcolepsy, idiopathic hypersomnia, Kleine–Levin syndrome, menstrual-related hypersomnia, idiopathic recurrent stupor, or circadian rhythm disturbances.[36] Another common complaint is insomnia, a set of symptoms which can have a great many different causes, physical and mental. Management in the varying situations differs greatly and cannot be undertaken without a correct diagnosis.[citation needed]


Sleep dentistry (bruxism, snoring and sleep apnea), while not recognized as one of the nine dental specialties, qualifies for board-certification by the American Board of Dental Sleep Medicine (ABDSM). The resulting Diplomate status is recognized by the American Academy of Sleep Medicine (AASM), and these dentists are organized in the Academy of Dental Sleep Medicine (USA).[37] The qualified dentists collaborate with sleep physicians at accredited sleep centers and can provide oral appliance therapy and upper airway surgery to treat or manage sleep-related breathing disorders.[38]


In the UK, knowledge of sleep medicine and possibilities for diagnosis and treatment seem to lag. Guardian.co.uk quotes the director of the Imperial College Healthcare Sleep Centre: "One problem is that there has been relatively little training in sleep medicine in this country – certainly there is no structured training for sleep physicians."[39] The Imperial College Healthcare site[40] shows attention to obstructive sleep apnea syndrome (OSA) and very few other sleep disorders. Some NHS trusts have specialist clinics for respiratory and/or neurological sleep medicine.



Epidemiology



Children and Young Adults


According to one meta-analysis, the two most prevalent sleep disorders among children are confusional arousals and sleep walking.[41] An estimated 17.3% of kids between 3 and 13 years old experience confusional arousals.[41] About 17% of children sleep walk, with the disorder being more common among boys than girls.[41] The peak ages of sleep walking are from 8 to 12 years old.[41] A different systematic review offers a high range of prevalence rates of sleep bruxism for children. Between 15.29 and 38.6% of preschoolers grind their teeth at least one night a week. All but one of the included studies reports decreasing bruxist prevalence as age increased as well as a higher prevalence among boys than girls.[42]


Another systematic review noted 7-16% of young adults suffer from delayed sleep phase disorder. This disorder reaches peak prevalence when people are in their 20s.[41] Between 20 and 26% of adolescents report a sleep onset latency of >30 minutes. Also, 7-36% have difficulty initiating sleep.[43] Asian teens tend to have a higher prevalence of all of these adverse sleep outcomes than their North American and European counterparts.[43]



Insomnia


Combining results from 17 studies on insomnia in China, a pooled prevalence of 15.0% is reported for the country.[44] This is considerably lower than a series of Western countries (50.5% in Poland, 37.2% in France and Italy, 27.1% in USA).[44] However, the result is consistent among other East Asian countries. Men and women residing in China experience insomnia at similar rates.[44] A separate meta-analysis focusing on this sleeping disorder in the elderly mentions that those with more than one physical or psychiatric malady experience it at a 60% higher rate than those with one condition or less. It also notes a higher prevalence of insomnia in women over the age of 50 than their male counterparts.[45]


A study that was resulted from a collaboration between Massachusetts General Hospital and Merck describes the development of an algorithm to identify patients will sleep disorders using electronic medical records. The algorithm that incorporated a combination of structured and unstructured variables identified more than 36,000 individuals with physician-documented insomnia.[46]



Obstructive Sleep Apnea


Obstructive sleep apnea (OSA) affects around 4% of men and 2% of women in the United States.[47] In general, this disorder is more prevalent among men. However, this difference tends to diminish with age. Women experience the highest risk for OSA during pregnancy.[48] Also, they tend to report experiencing depression and insomnia in conjunction with obstructive sleep apnea.[49] In a meta-analysis of the various Asian countries, India and China present the highest prevalence of the disorder. Specifically, about 13.7% of the Indian population and 7% of Hong-Kong's population is estimated to have OSA. The two groups experience daytime OSA symptoms such as difficulties concentrating, mood swings, or high blood pressure,[50] at similar rates (prevalence of 3.5% and 3.57%, respectively).[47]



Sleep Paralysis


A systematic review states 7.6% of the general population experiences sleep paralysis at least once in their lifetime. Its prevalence among men is 15.9% while 18.9% of women experience it. When considering specific populations, 28.3% of students and 31.9% of psychiatric patients have experienced this phenomenon at least once in their lifetime. Of those psychiatric patients, 34.6% have panic disorder. Sleep paralysis in students is slightly more prevalent for those of Asian descent (39.9%) than other ethnicities (Hispanic: 34.5%, African descent: 31.4%, Caucasian 30.8%).[51]



Restless Leg Syndrome


According to one meta-analysis, the mean prevalence rate for North America and Western Europe is estimated to be 14.5±8.0%. Specifically in the United States, the prevalence of restless leg syndrome is estimated to be between 5 and 15.7% when using strict diagnostic criteria. RLS is over 35% more prevalent in American women than their male counterparts.[52]



See also




  • Chronotypes

  • Health effects from noise

  • International Classification of Sleep Disorders

  • Polysomnographic technologist

  • Sleep hygiene

  • Sleep study

  • Sundowning

  • Vegetative symptoms

  • White noise machine




References





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External links











Classification
D



  • ICD-10: F51, G47


  • ICD-9-CM: 307.4, 327, 780.5


  • MeSH: D012893


  • DiseasesDB: 26877


External resources


  • MedlinePlus: 000800


  • eMedicine: med/609




  • Sleep Problems – information leaflet from mental health charity The Royal College of Psychiatrists


  • [2] Sleep Disorders Health Center


  • Sleep Disorder: Sleep Deprivation Causes, Symptoms, and Effects











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