Gina Johnson
Shift work sleep disorder (SWSD) is a condition that affects people who work outside the hours of 6 am and 7 pm, including fixed and rotating shifts. It is characterised by insomnia, excessive sleepiness, or both, with an estimated 10-40% of shift workers experiencing SWSD. The disorder is caused by a misalignment between the body's natural sleep-wake cycle and the circadian rhythms that regulate sleep, resulting in significant sleep loss and negative health consequences. Shift work sleep disorder can lead to poor concentration, accidents, absenteeism, errors, injuries, and fatalities, especially in dangerous occupations. It is important for individuals experiencing symptoms of SWSD to seek treatment to improve their health, well-being, and safety.
| Characteristics | Values |
|---|---|
| Definition | A condition that primarily affects people who work night, early morning, and rotating shifts |
| Prevalence | 14.1% to 32% of night workers and 8.1% to 26% of rotating shift workers meet the criteria for SWD |
| Symptoms | Insomnia, excessive sleepiness, or both |
| Sleep Loss | The average person with shift work disorder loses one to four hours of sleep per night |
| Health Risks | Decreased bone mineral density, risk of fracture, low fertility, issues during pregnancy, obesity, diabetes, insulin resistance, elevated body fat levels, dyslipidemias, depression, anxiety, alcohol use disorder, increased levels of t-tau in blood plasma, decreased levels of Natural Killer cells, increased risk of developing the common cold, increased systemic levels of CRP (a marker of cardiovascular disease) |
| Treatment | Behavioral or pharmacologic therapy |
| Prevention | Adjusting the bedroom environment to promote a more restful atmosphere, allowing for a better quality of sleep |
| Diagnosis | Patients should report symptoms for at least one month, with disturbed sleep-wake patterns for at least two weeks |
| Impact | Shift work disorder can lead to poor concentration, accidents, absenteeism, errors, injuries, and fatalities |
| Type of Disorder | Circadian rhythm sleep disorder |
| Cause | Misalignment between the body and the circadian rhythms that regulate the sleep-wake cycle |
| Prevalence in Shift Workers | 10-40% of shift workers have SWSD |
| Shift Work Definition | Any shift that falls outside the hours of 6 am and 7 pm, including fixed and rotating hours |
| Prevalence of Shift Work | 16% of wage and salary employees in the US follow shift work schedules |
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What You'll Learn
Shift work disorder is a circadian rhythm sleep disorder
Shift work disorder, also known as shift work sleep disorder (SWSD), is a condition that primarily affects people who work night, early morning, or rotating shifts. It is a type of circadian rhythm sleep disorder, characterised by a misalignment between an individual's body and their natural circadian rhythms, which regulate the sleep-wake cycle.
The circadian rhythm is largely guided by natural light and darkness. During the day, the retinas in our eyes perceive sunlight and signal the brain to release hormones like cortisol, which keep us feeling alert and energised. As the sun sets and light fades, our brains produce melatonin, which induces feelings of sleepiness and relaxation. Shift work disorder occurs when an individual's work schedule overlaps with their typical sleep period, resulting in insomnia, excessive sleepiness, or both. Insomnia can manifest as difficulty falling asleep or waking up before an individual has had sufficient sleep.
The symptoms of shift work sleep disorder can vary depending on the specific shift worked. For example, those working early morning shifts may experience difficulty falling asleep, while those working evening shifts might wake up during the night. The average person with shift work disorder loses one to four hours of sleep per night. This sleep loss can have significant negative consequences on overall health and quality of life, including decreased cognitive performance, poor concentration, and increased risk of accidents, errors, and injuries.
Shift work disorder is a common condition, with estimates suggesting that it affects 2-10% of the general population and about 27% of night and rotating shift workers. It is particularly prevalent in certain occupations, including nurses, doctors, pilots, firefighters, police officers, and commercial drivers. Given the potential health risks and performance impairments associated with shift work disorder, it is important for individuals experiencing symptoms to seek diagnosis and treatment.
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Insomnia and excessive sleepiness are symptoms
Insomnia and excessive sleepiness are the two predominant symptoms of shift work sleep disorder (SWSD). SWSD is a circadian rhythm sleep disorder that affects people whose work hours overlap with the typical sleep period.
Insomnia is characterised by difficulty falling or staying asleep. People with SWSD who work between 4 a.m. and 7 a.m. often struggle to fall asleep, while those who work in the evening tend to have issues staying asleep. Insomnia can also persist after changing schedules, and this can warrant a separate diagnosis for chronic insomnia disorder.
Excessive sleepiness, or hypersomnia, occurs at unwanted times, such as when an individual is at work or needs to be productive, awake, and alert. This can be dangerous and impair work performance, leading to increased accident risk and financial costs for employers.
The average person with SWSD loses one to four hours of sleep per night, with sleep loss and decreased quality of sleep being another effect of shift work. This can impact cognitive performance, causing difficulty concentrating and slowing down reaction times.
In addition to insomnia and excessive sleepiness, SWSD is associated with other symptoms such as lack of energy, decreased alertness, poor mood, and irritability. These symptoms can vary depending on the individual's specific work schedule, with some people adapting better to working at night and sleeping during the day.
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Health risks include bone density loss and mental disorders
Shift work sleep disorder (SWSD) is a circadian rhythm sleep disorder that affects people who work non-traditional hours outside the "regular" 9 a.m. to 5 p.m. workday. This includes overnight, early morning, or rotating shifts. SWSD is characterised by insomnia, excessive sleepiness, or both, and it can have various health risks, including bone density loss and mental disorders.
Bone Density Loss
There is a growing body of literature suggesting that abnormal sleep duration and circadian disruption from night shift work may impact bone health and increase the risk of osteoporosis and fractures. Studies have found lower bone mineral density (BMD) in night shift workers, indicating a potential link between shift work and bone loss. However, the results from epidemiological human studies on this association have been mixed, with some studies finding no significant difference in BMD according to the shift worked.
Mental Disorders
Shift workers are at an increased risk of developing mental disorders and experiencing greater psychosocial distress. They may experience symptoms such as depression, anxiety, alcohol abuse, and work stress spillover, leading to a poorer quality of life. Shift work sleep disorder can also impair cognitive performance, making it difficult to stay focused and concentrate and react quickly. This can affect work efficiency and increase the risk of accidents, especially in tasks such as driving or flying.
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Shift work disorder is underdiagnosed
Shift work disorder (SWD) is a condition that affects people who work outside the hours of 6 am and 7 pm, including fixed and rotating shifts. It is a circadian rhythm sleep disorder, which means that it is characterised by a misalignment between the body's natural sleep-wake cycle and the external environment. This can lead to insomnia, excessive sleepiness, or both.
SWD is a common condition, with estimates suggesting that it affects 10-40% of shift workers. However, it often goes underdiagnosed. This could be due to several reasons. Firstly, the prevalence of SWD is understudied, and there is a lack of comprehensive data on the disorder. This makes it challenging to accurately diagnose and may result in many cases going unnoticed or misdiagnosed.
Additionally, the symptoms of SWD can vary depending on the individual's specific work schedule. For example, those working early morning shifts may experience different symptoms than those working night shifts. This variability in presentation can make it challenging for healthcare providers to recognise and diagnose SWD, especially if they are not familiar with the various manifestations of the disorder.
Another factor contributing to the underdiagnosis of SWD is the stigma surrounding sleep disorders. Many individuals may be reluctant to seek help due to feelings of embarrassment or shame associated with sleep issues. They may also attribute their symptoms to other causes, such as stress or age, rather than recognising them as potential signs of a sleep disorder.
Furthermore, the nature of shift work itself can pose challenges to diagnosis. Shift workers may have limited access to healthcare due to their unconventional work hours, making it difficult to schedule appointments and seek professional help. They may also be concerned about the potential impact of a diagnosis on their employment, particularly if they work in industries where shift work is prevalent and necessary for operational continuity.
The underdiagnosis of SWD has significant implications. It can lead to a decrease in workplace productivity, increased absenteeism, and a higher risk of accidents and errors. Additionally, the individual may experience adverse health consequences, including cognitive complaints, decreased immune function, and an increased risk of chronic illnesses such as cardiovascular disease.
Therefore, raising awareness about SWD, improving access to healthcare for shift workers, and encouraging individuals to prioritise their sleep health are crucial steps towards addressing the underdiagnosis of this disorder.
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Treatment options include behavioural and pharmacological therapy
Shift work sleep disorder (SWSD) is a circadian rhythm sleep disorder that affects people who work non-traditional hours outside the "regular" 9 a.m. to 5 p.m. workday. This includes overnight, early morning, or rotating shifts. While there is no cure for SWSD, various treatment options can help manage the symptoms, including behavioural therapy, bright light therapy, melatonin supplements, sleep medications, and lifestyle changes.
Behavioural Therapy
Behavioural therapy for shift work disorder has been shown to improve sleep, reduce sleepiness, and enhance mental health in shift workers. A study involving night shift workers experiencing SWSD found that those who underwent behavioural therapy reported significant improvements in daytime insomnia severity and total sleep time compared to a control group. The therapy included sleep restriction therapy, stimulus control, and fixed sleep periods in the dark.
Bright Light Therapy
Bright light therapy involves exposure to a specific type of light to help the body adjust to a new sleep schedule. This therapy is especially beneficial for night shift workers. The light can be in the form of a lightbox, desk lamp, or light goggles, and it is typically used at the beginning of the shift. By using bright light therapy, individuals can shift their circadian rhythm earlier or later, aiding in adjusting to different shift schedules.
Melatonin Supplements and Sleep Medications
Melatonin supplements can help individuals adapt to a shift work schedule by inducing feelings of sleepiness when taken at the appropriate time. It is important to consult a healthcare provider before taking melatonin supplements. In some cases, a sleeping pill may be prescribed to help individuals sleep at the desired times. Additionally, wake-promoting medications can be used to enhance alertness during shifts.
Lifestyle Changes
Lifestyle modifications play a crucial role in managing SWSD. This includes practising good sleep hygiene by planning a consistent sleep schedule, even on days off, and avoiding caffeine, alcohol, and nicotine. Regular exercise can also help regulate the sleep-wake cycle, although the timing of the exercise should be carefully considered. Additionally, minimising exposure to sunlight when trying to sleep during the day and using dark sunglasses when outdoors can aid in reducing the impact of sunlight on the sleep-wake cycle.
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Frequently asked questions
Shift Work Sleep Disorder (SWSD) is a circadian rhythm sleep disorder that affects people who work non-traditional hours. It causes issues with falling asleep, staying asleep, and sleepiness at unwanted times.
The defining symptoms of SWSD are insomnia, excessive sleepiness while awake, and recurring sleep loss. People with SWSD may also experience chronic sleep deprivation, which can increase their risk of falling asleep at the wheel or making errors on the job.
It is estimated that between 10 to 40 percent of shift workers experience SWSD. Those who have regularly shifting schedules are most likely to be affected.
A key part of diagnosing SWSD is keeping a sleep journal for at least two weeks. Your healthcare provider will ask you questions about your sleep patterns, disturbances, and the type of shift you work. They may also ask for a sleep study to rule out other conditions such as sleep apnea or medication side effects.
SWSD can be treated with lifestyle changes, light therapy, and/or medication. Lifestyle changes include maintaining a regular sleep schedule, limiting caffeine intake, and creating a dark environment for sleeping. Medications such as melatonin, hypnotics, and sedatives may also be prescribed by a doctor.
