Ashwin Lewis
Shift work sleep disorder (SWSD) is a chronic condition that affects people working non-traditional hours, such as split, graveyard, or rotating shifts. The disorder arises when an individual's work schedule regularly interferes with their sleep, resulting in insufficient or disrupted sleep. To diagnose SWSD, doctors often rely on a patient's sleep history, including sleep-wake patterns and activities recorded in a sleep log over 7 to 14 days. Actigraphy tests, which involve wearing sensors on the wrist or ankle for 14 days, can also be used to monitor sleep-wake cycles. If these initial assessments indicate disturbed sleep patterns, additional tests may be conducted to rule out other sleep disorders with similar symptoms, such as narcolepsy or insomnia.
| Characteristics | Values |
|---|---|
| Definition | A sleep disorder that affects people working non-traditional hours like split, graveyard, or rotating shifts |
| Symptoms | Insomnia, extreme sleepiness, irritability, mood changes, impaired social function, and depression |
| Risk Factors | Working night shifts, early morning shifts, or swing shifts; older age, and female gender |
| Diagnosis | Based on sleep history, sleep logs, actigraphy tests, polysomnography, and multiple sleep latency tests |
| Treatment | Non-pharmacological interventions (e.g. exercise, light exposure), medications (melatonin, caffeine), modafinil, and armodafinil |
| Prevention | Keeping a regular sleep schedule, taking 48 hours off after shifts, wearing sunglasses, limiting caffeine intake, maintaining a healthy diet, using heavy shades during sleep |
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What You'll Learn
- Diagnosis criteria: SWD is recognised in all major diagnostic nosologies, including the DSM and ICSD
- Doctor's appointment: Doctors will ask about work and sleep patterns, and may request a physical exam to rule out other conditions
- Sleep study: Doctors may order an overnight sleep study to rule out other sleep disorders
- Symptoms: Insomnia, excessive sleepiness, and sleep loss are defining symptoms of SWD
- Treatment: Treatments include lifestyle changes, light therapy, and medication
Diagnosis criteria: SWD is recognised in all major diagnostic nosologies, including the DSM and ICSD
Shift Work Sleep Disorder (SWD) is a recognised diagnosis in major diagnostic nosologies, including the Diagnostic and Statistical Manual of Mental Disorders (DSM) and the International Classification of Sleep Disorders (ICSD). Nosology is a branch of medical science that deals with the classification of diseases and other medical conditions. The classification of psychiatric illness has a long history, with early attempts to classify diseases by their symptoms, and modern systems focusing on grouping diseases by the anatomy and cause involved.
The DSM, published by the American Psychiatric Association, is currently in its 5th edition (DSM-5) and has evolved since its inception in a politically driven manner. It represents a significant shift in nosology, steering psychiatry towards reconciliation with the rest of medicine. The manual provides diagnostic criteria for specific diseases, with clinically well-defined criteria, verified by physical findings, laboratory data, and treatment responses.
The ICSD, published by the American Academy of Sleep Medicine in cooperation with international sleep societies, is currently in its 3rd edition (ICSD-3). It serves as the key reference work for diagnosing sleep disorders, identifying seven major categories: insomnia disorders, sleep-related breathing disorders, central disorders of hypersomnolence, circadian rhythm sleep-wake disorders, sleep-related movement disorders, parasomnias, and other sleep disorders.
The recognition of SWD in these major nosologies highlights the importance of addressing sleep issues associated with shift work. The inclusion of SWD in the DSM and ICSD provides a standardised framework for healthcare professionals to diagnose and manage this disorder effectively, contributing to improved sleep health and overall well-being for individuals engaged in shift work.
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Doctor's appointment: Doctors will ask about work and sleep patterns, and may request a physical exam to rule out other conditions
If you are experiencing symptoms of shift work sleep disorder, it is important to talk to a healthcare provider about finding a suitable solution. During a doctor's appointment, the doctor will ask about your work and sleep patterns, and may request a physical exam to rule out other conditions.
The doctor will likely ask you a series of questions about your sleep patterns and disturbances, as well as the type of shift you work. They may ask you to maintain a sleep diary for at least seven days, covering your sleep-wake patterns and activities. This will help them understand your sleep history and any potential disruptions to your sleep cycle.
In addition to evaluating your sleep log, the doctor may request that you undergo actigraphy tests. These non-invasive tests involve wearing a sensor on your wrist or ankle for 14 consecutive days, both day and night. Actigraphy tests are often recommended in conjunction with light exposure measurements to accurately assess your sleep patterns.
If the initial evaluation and actigraphy tests indicate a disturbed sleep and wake pattern, you may receive a shift work disorder diagnosis. However, additional tests may be required to rule out other conditions with similar symptoms, such as insomnia, narcolepsy, obstructive sleep apnea, or other circadian rhythm disorders.
One such additional test is polysomnography, also known as a sleep study. This test typically involves spending the night at a hospital or sleep clinic, but for shift work disorder, it may be conducted during the day. An EEG will monitor your vital signs and behaviours during non-rapid eye movement and rapid eye movement stages of sleep.
Another test is the Multiple Sleep Latency Test (MSLT), which measures how long it takes you to fall asleep during the day. The MSLT involves four to five 20-minute nap sessions interspersed with two-hour breaks, and you will wear sensors to measure your sleep-wake cycle.
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Sleep study: Doctors may order an overnight sleep study to rule out other sleep disorders
Sleep plays a vital role in our health and well-being. A good night's rest is especially important for shift workers, who may be susceptible to shift work disorder (SWD), a circadian rhythm sleep disorder. To diagnose or rule out SWD, doctors may recommend an overnight sleep study, also known as a nocturnal polysomnogram (PSG).
A sleep study is a diagnostic test used to identify or rule out health issues, particularly those affecting sleep. It is typically conducted in a sleep lab or clinic, where trained sleep technologists monitor patients overnight. The timing of the study is tailored to the patient's regular sleep habits, with the option of scheduling studies for those who work at night and sleep during the day.
During the sleep study, various sensors are attached to the patient's body to record vital signs and behaviours. These sensors may include electroencephalography (EEG) to detect brain waves, electrocardiography (EKG or ECG) to monitor heart activity, and electromyography (EMG) to track muscle movement. Eye movements (EOG) and airflow measurements also provide valuable data for analysis.
The process of attaching these sensors is straightforward. The sensors are either adhesive or taped to the skin, with staff taking care to accommodate any sensitive skin or adhesive allergies. Patients are advised to follow specific guidelines on bathing and grooming before the study, avoiding the use of creams or lotions that could interfere with the sensors.
Sleep studies are an essential tool for diagnosing or ruling out a range of sleep disorders, including obstructive sleep apnea, narcolepsy, periodic limb movement disorder, sleepwalking, sleep paralysis, and other parasomnias. By undergoing these studies, doctors can gain valuable insights into a patient's sleep patterns and make informed decisions regarding their treatment plans.
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Symptoms: Insomnia, excessive sleepiness, and sleep loss are defining symptoms of SWD
Insomnia, excessive sleepiness, and sleep loss are the defining symptoms of shift work sleep disorder (SWSD). SWSD is a circadian rhythm sleep disorder that affects people who work non-traditional hours, such as night, early morning, or rotating shifts. The condition arises from a mismatch between one's internal body clock and the external environment, resulting in a disruption of the natural sleep-wake cycle.
Insomnia, in the context of SWSD, refers to difficulty falling or staying asleep. The manifestation of insomnia symptoms can vary depending on work schedules. For instance, those working from 4 a.m. to 7 a.m. might struggle to fall asleep, while those with evening shifts may have trouble staying asleep. Insomnia can also persist after transitioning to a conventional work schedule, warranting a separate diagnosis for chronic insomnia disorder.
Excessive sleepiness, or hypersomnia, occurs at unwanted times, often when individuals with SWSD are working during the night or early morning hours. This can impair work performance and even lead to accidents or errors on the job. Sleep loss is another significant symptom of SWSD, with affected individuals losing one to four hours of sleep per night, on average. This sleep loss can have cascading effects on overall health, exacerbating gastrointestinal, metabolic, reproductive, and cardiovascular issues.
The diagnosis of SWSD is typically based on sleep history, with patients recording their sleep-wake patterns and activities in a sleep log for 14 days. Actigraphy tests, which involve wearing a sensor on the wrist or ankle for 14 consecutive days, can also be used to objectively assess sleep patterns. Polysomnography, or a sleep study, may be conducted during the day instead of at night to evaluate an individual's vital signs and behaviours during different sleep stages. The Multiple Sleep Latency Test (MSLT) is another tool used to measure how quickly an individual falls asleep during the day, involving a series of naps and breaks.
If you suspect you have SWSD, it is important to consult a healthcare provider. Treatment options include lifestyle changes, light therapy, melatonin supplements, and medication.
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Treatment: Treatments include lifestyle changes, light therapy, and medication
While shift work disorder (SWD) is considered a separate condition, its diagnosis often hinges on insomnia symptoms. It is a complex of circadian, sleep, and domestic or social factors. Treatment for SWD includes lifestyle changes, light therapy, and medication.
Lifestyle Changes
Lifestyle factors such as alcohol use, cigarette smoking, and dietary practices should be assessed, as shift workers tend to demonstrate unhealthy lifestyle choices in these domains. Shift workers should also be encouraged to keep a set sleep schedule throughout the week.
Additionally, it is important to adjust the bedroom environment to promote a more restful atmosphere, allowing for better sleep quality. This includes proper bedroom lighting and eliminating environmental factors such as noise that can disrupt sleep.
Light Therapy
For those who work night shifts, light treatment in the evening is recommended. This involves using a light box that emits extremely bright light for 15 to 30 minutes. However, it is crucial to use the light at the appropriate time of day and for the right duration, which a sleep specialist can help determine.
Medication
Treatment for SWD may also include pharmacologic therapy to help alleviate symptoms. However, it is important to note that medication use should not be the primary cause of the sleep disorder.
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Frequently asked questions
Shift work sleep disorder (SWSD) is a chronic condition that affects people who work non-traditional hours, such as split shifts, graveyard shifts, or rotating shifts. It occurs when an individual's work schedule regularly interferes with their sleep, resulting in insufficient and disrupted sleep. This disorder can lead to insomnia, extreme sleepiness during waking hours, and a higher risk of accidents and errors on the job.
Diagnosis of SWSD typically involves assessing an individual's sleep history and patterns. Patients may be asked to maintain a sleep log or diary for at least seven to fourteen days, recording their sleep-wake patterns, activities, and disturbances. Actigraphy tests may also be recommended, where individuals wear a sensor on their wrist or ankle for 14 days to monitor their sleep-wake cycle. If these initial evaluations indicate disturbed sleep patterns, additional tests may be conducted to rule out other sleep disorders with similar symptoms, such as narcolepsy or obstructive sleep apnea.
Individuals with SWSD may experience insomnia, excessive sleepiness during their waking hours, irritability, mood changes, impaired social function, and an increased risk of accidents and errors at work. The disorder can significantly impact an individual's daily life, and they may never feel well-rested due to built-up sleep deprivation.
Treatment options for SWSD include lifestyle changes, such as maintaining a regular sleep schedule, limiting caffeine intake, taking naps when possible, and minimizing sun exposure after night shifts. Additionally, medical interventions may include medications containing melatonin or caffeine, as well as modafinil and armodafinil, which are approved to improve wakefulness in patients with excessive sleepiness associated with SWSD.
