Gina Johnson
Sleep-wake disorders are a common clinical problem, affecting many people's quality of life. They occur when the body's internal clock malfunctions or becomes out of sync with the surrounding environment, resulting in problems with the quality, timing, and amount of sleep. Sleep-wake disorders can be primary or secondary, with the former arising from an endogenous disturbance in sleep-wake generating or timing mechanisms, and the latter often co-occurring with medical or mental health conditions such as depression, anxiety, or cognitive disorders. There are more than 80 different sleep disorders, with insomnia being the most prevalent. Other sleep-wake disorders include sleep apnea, parasomnias, narcolepsy, hypersomnia, restless leg syndrome, and circadian rhythm sleep disorders.
| Characteristics | Values |
|---|---|
| Types | Insomnia, Sleep Apnea, Parasomnia, Narcolepsy, Restless Leg Syndrome, Hypersomnia, Circadian Rhythm Disorders |
| Insomnia Diagnosis | Physician rules out other sleep disorders, medication side effects, substance misuse, depression, and other illnesses. Comprehensive assessment may include patient history, physical exam, sleep diary, and clinical testing. |
| Insomnia Symptoms | Regularly taking more than 30 minutes to fall asleep, waking up several times a night, feeling sleepy during the day, taking frequent naps, falling asleep during the day |
| Sleep Apnea Symptoms | Snoring loudly, snorting, gasping, choking, stopping breathing for short periods |
| Restless Leg Syndrome Symptoms | Creeping, tingling, crawling feelings in legs or arms, relieved by movement or massage |
| Circadian Rhythm Disorders | Misalignment of body clock and external light-darkness cycle, causing ongoing sleep problems and extreme sleepiness during the day |
| Parasomnias | Unusual experiences or behaviours during sleep, including sleep terror disorder, sleepwalking, and nightmare disorder |
| Dyssomnias | Abnormalities in the amount, quality, or timing of sleep, including insomnia, hypersomnia, narcolepsy, sleep apnea, and circadian rhythm sleep disorder |
| Causes | Ageing, cardiac conditions, neurologic conditions, endocrine conditions, pulmonary conditions, gastrointestinal conditions, hematologic conditions, substance use or withdrawal, anxiety, depression |
| Treatment | Good sleep habits, lifestyle changes, cognitive behavioural therapy, relaxation techniques, CPAP machine, medication |
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What You'll Learn
Insomnia
Sleep-wake disorders occur when the body's internal clock malfunctions or becomes desynchronized with the surrounding environment. One of the most common sleep-wake disorders is insomnia, which affects about 10% of the world's population. Insomnia is characterized by difficulty falling asleep, staying asleep, or experiencing non-restorative sleep. To be diagnosed with insomnia, these difficulties must be present despite having an adequate opportunity and environment for sleep, and they must result in daytime impairment or distress, occurring at least three times a week for a minimum of one month.
Several risk factors for insomnia have been identified, with age and gender being the most prominent. The prevalence of insomnia increases with age and is more common in women, particularly during the onset of menses and menopause. The presence of comorbid medical conditions, psychiatric disorders, and working night or rotating shifts also contribute to a higher risk of insomnia. However, these factors do not independently cause insomnia but rather act as precipitants in individuals who are predisposed to it.
The effects of insomnia can vary, and while it is usually not dangerous, long-term or severe cases can lead to more serious consequences. Treatment options are available, including medications and mental health approaches. A comprehensive assessment for insomnia involves taking a patient history, conducting a physical examination, maintaining a sleep diary, and performing clinical tests such as a sleep study or polysomnography.
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Sleep apnea
Sleep disorders, or sleep-wake disorders, are conditions that disturb an individual's normal sleep patterns, affecting the quality, timing, and amount of sleep. This can result in daytime distress and impairment in functioning. Sleep-wake disorders often co-occur with other medical or mental health conditions, such as depression, anxiety, or cognitive disorders. Sleep is essential for both physical and mental health, and inadequate sleep can lead to various issues, including fatigue, decreased energy, irritability, and problems with concentration and decision-making.
One of the sleep-wake disorders is sleep apnea, a common condition that disrupts breathing during sleep. People with sleep apnea experience repeated pauses in breathing that can last for 10 seconds or longer, causing them to briefly awaken and reducing their overall sleep quality. Sleep apnea has two main types: obstructive sleep apnea (OSA) and central sleep apnea (CSA).
Obstructive sleep apnea, the more prevalent form, occurs when the upper airway becomes blocked or narrowed during sleep due to factors such as obesity, enlarged tonsils, or hormonal changes. This blockage can lead to reduced or completely stopped airflow, resulting in symptoms like loud snoring, gasping for air, and excessive daytime sleepiness. Obstructive sleep apnea is estimated to affect 10-30% of adults, but it often goes undiagnosed.
On the other hand, central sleep apnea is less common and arises when there is a disruption in the communication between the brain and the muscles involved in breathing. This miscommunication causes temporary pauses or shallow breathing. Health conditions that affect how the brain controls airways and chest muscles can contribute to central sleep apnea.
The symptoms of sleep apnea can include loud snoring, gasping for air during sleep, headaches, and excessive daytime sleepiness. Sleep apnea can have serious health consequences if left untreated. It can increase the risk of stroke and heart attack and lead to issues with concentration, memory, and behaviour control. Therefore, it is crucial to seek medical advice and treatment for sleep apnea. Treatment options include the use of continuous positive airway pressure (CPAP) machines, lifestyle changes, and, in some cases, surgery to correct the underlying problem.
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Parasomnias
There are three main groupings of parasomnias based on the stage of sleep in which they occur. Non-REM parasomnias involve physical and verbal activity, and the sleeper may appear to act with intention, but they may not respond when spoken to and will likely have no memory of the event afterward. They are often referred to as "disorders of arousal" because the sleeper is partially awake. Non-REM parasomnias include sleepwalking, night terrors, and sleep-related eating disorders. Sleepwalking, or somnambulism, is when a person gets out of bed and walks around while still asleep. They may also engage in repetitive movements, such as fumbling with clothing, or even talk. Sleep-related eating disorder causes individuals to eat and drink while asleep, sometimes consuming inedible or toxic foods, leading to potential dangers such as choking or injuries from food preparation.
REM parasomnias, which occur during the REM stage of sleep when dreams are most vivid, include nightmares, night terrors, and REM sleep behaviour disorder (RSBD). Nightmares are frightening dreams that cause sleepers to wake up suddenly, feeling anxious and upset, and are usually recalled in detail. They are more common in adults and are often linked to conditions such as post-traumatic stress disorder, depression, and schizophrenia. Night terrors, on the other hand, are more common in children and typically occur within a few hours of falling asleep. The sleeper abruptly wakes up feeling afraid, with their eyes open, but they seem confused and are unable to communicate. While nightmares are usually remembered in detail, night terrors often result in no memory or a vague recollection of the event.
RSBD involves acting out dreams through vocalisations or aggressive movements such as punching, kicking, or grabbing. Sleep enuresis, or bedwetting, is another type of parasomnia that typically occurs in children aged 5 and above, happening at least twice a week for at least three months. Sleep-related groaning, or catathrenia, causes individuals to make repeated moaning or groaning noises during sleep. Finally, exploding head syndrome is a parasomnia in which individuals hear a loud noise or explosive crashing sound as they are falling asleep or waking up.
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Narcolepsy
Sleep-wake disorders occur when the body's internal clock malfunctions or becomes desynchronized with the surrounding environment. One such disorder is narcolepsy, a condition in which the brain is unable to regulate sleep and wakefulness. People with narcolepsy experience "sleep attacks" or excessive daytime sleepiness, where they feel an overwhelming urge to fall asleep during the day. These sleep periods are usually short, lasting about 15 to 30 minutes, but they can occur several times a day, significantly disrupting an individual's daily life, work, and social relationships.
The third symptom of narcolepsy is sleep paralysis, where an individual is unable to move or speak upon waking up, yet they can still breathe and move their eyes. Sleep paralysis is often accompanied by vivid and frightening hallucinations, adding to the distress of the condition. Fortunately, episodes of sleep paralysis are typically brief, lasting only a few minutes. The fourth key symptom is automatic behaviour, where individuals continue performing activities without conscious awareness or recollection of their actions.
In addition to these core symptoms, people with narcolepsy may experience other issues such as restless sleep, frequent waking, vivid nightmares, and physically acting out their dreams. The causes of narcolepsy are linked to the hypothalamus, a region of the brain that helps regulate sleep and wakefulness through the production of orexins, a type of chemical molecule used for communication between neurons. While narcolepsy can be challenging to live with, it usually responds well to treatment, and proper management can help minimize its impact on daily functioning and quality of life.
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Restless leg syndrome
The symptoms of RLS are typically relieved by movement, and people with this condition may need to constantly move their legs or pace the floor to minimise discomfort. Symptoms often worsen at night and improve during the day, with a distinct symptom-free period in the early morning. RLS can vary from person to person and day to day, with some people experiencing symptoms only once or twice a week. However, it can still significantly impact sleep and daytime functioning.
The cause of RLS is unknown in most cases, but it often has a genetic component and runs in families. It is also associated with specific gene variants and may be related to low levels of iron in the brain or dysfunction in the basal ganglia, a brain area that controls movement using the chemical dopamine. RLS can develop at any age but usually begins in middle age, and it is more common in women than in men.
RLS is often diagnosed when individuals experience difficulty sleeping and report a compelling urge to move their legs. A physician will rule out other potential causes, such as medication side effects, substance misuse, or other physical and mental illnesses. A comprehensive assessment may include a patient history, a physical exam, a sleep diary, and clinical testing, such as a sleep study or polysomnography. Treatment options for RLS can include good sleep habits, lifestyle changes, cognitive-behavioural therapy, and, in some cases, medication.
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Frequently asked questions
Sleep-wake disorders occur when the body’s internal clock does not work properly or is out of sync with the surrounding environment. Sleep disorders can be primary or secondary. Primary sleep disorders are disturbances in sleep-wake generating or timing mechanisms, while secondary sleep disorders are caused by other conditions, such as anxiety and depression.
There are more than 80 different sleep disorders. Some of the major types include insomnia, sleep apnea, restless leg syndrome, hypersomnia, circadian rhythm disorders, and parasomnia.
To diagnose a sleep-wake disorder, a physician will rule out other sleep disorders, medication side effects, substance misuse, depression, and other physical and mental illnesses. A comprehensive assessment may involve a patient history, a physical exam, a sleep diary, and clinical testing such as a sleep study or polysomnography.
