Miya Pearson
Shift work sleep disorder (SWSD) is a condition that affects people who work outside the hours of 6 am and 7 pm, including split shifts, graveyard shifts, early morning shifts, or rotating shifts. It is characterised by excessive sleepiness, lack of refreshing sleep, and drowsiness, which can affect both work and leisure time. The disruption to the body's natural sleep-wake cycle can lead to insomnia and fatigue, causing health, social, and safety concerns for workers. If you are experiencing symptoms of SWSD, there are lifestyle changes you can make to relieve your symptoms, and you should consult a doctor for a clinical evaluation and treatment options.
| Characteristics | Values |
|---|---|
| Work Hours | Non-traditional hours like split shifts, graveyard shifts, early morning shifts, or rotating shifts |
| Circadian Rhythm | Disrupted by the non-traditional work schedule |
| Sleep Loss | Average loss of one to four hours of sleep per night |
| Insomnia | Difficulty falling asleep or staying asleep |
| Excessive Sleepiness | Feeling sleepy during work hours |
| Alertness | Reduced alertness and functioning |
| Performance | Impaired performance and functioning |
| Mood | Irritability, impatience, and inability to cope with problems or conflicts |
| Social Impairments | Social isolation and reduced social engagement |
| Health Risks | Increased risk of heart disease, weight gain, cancer, problems in pregnancy, depression, anxiety, and memory issues |
| Safety Risks | Higher risk of accidents, both at the workplace and while driving |
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What You'll Learn
- Symptoms: Excessive sleepiness, insomnia, and drowsiness
- Causes: Working non-traditional hours, like graveyard shifts or rotating shifts
- Diagnosis: Requires symptoms for at least three months, with disturbed sleep-wake patterns for two weeks
- Treatment: Lifestyle changes, like a regular sleep schedule, naps, and limiting caffeine
- Risks: Health, social, and safety concerns, including accidents, heart disease, and depression
Symptoms: Excessive sleepiness, insomnia, and drowsiness
Shift work sleep disorder (SWSD) is a condition that primarily affects people who work night, early morning, or rotating shifts. It is characterized by excessive sleepiness, insomnia, and drowsiness, which can affect both work and leisure time.
Excessive Sleepiness
People with SWSD often experience excessive sleepiness during their desired waking period, particularly when working night or early morning shifts. This can impair their work performance, decrease their alertness and reaction time, and increase their risk of accidents, especially while driving.
Insomnia
Insomnia is a common symptom of SWSD, manifesting as difficulty falling or staying asleep. The timing of insomnia may vary depending on the shift worked. For example, those working early morning shifts may struggle to fall asleep, while those working evening shifts might have trouble staying asleep.
Drowsiness
Drowsiness is a significant issue for people with SWSD, especially when driving or commuting. It can lead to a higher risk of vehicular accidents, with many drowsy driving collisions occurring between midnight and 6 a.m.
If you suspect you may have SWSD, it is important to consult a healthcare provider. They may ask you to keep a sleep journal or diary for at least two weeks to track your sleep patterns and disturbances. Lifestyle changes, such as maintaining a regular sleep schedule and limiting caffeine intake, can also help alleviate symptoms.
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Causes: Working non-traditional hours, like graveyard shifts or rotating shifts
Working non-traditional hours, such as graveyard shifts or rotating shifts, can cause shift work sleep disorder (SWSD) due to the disruption it causes to the body's natural circadian rhythm or "biological clock". This rhythm is a 24-hour cycle of physical, mental, and behavioural changes that are primarily guided by natural light and darkness. Working outside the regular 9-5 workday, for example, can cause a misalignment between an individual's internal body clock and their work and sleep hours.
Graveyard shift workers, for instance, may need to reduce their exposure to light after leaving work if they plan to sleep as soon as they get home. This can be done by wearing blue light-blocking glasses or using blackout shades in the bedroom. On the other hand, those working early morning shifts may experience trouble falling asleep, while those with evening shifts may wake up during the night.
Rotating shifts can also be more challenging to deal with than working the same shift for a longer period. This is because the body's internal clock is constantly being disrupted, and the worker's eating habits may be affected, with a higher likelihood of snacking more at night and consuming fewer healthy foods.
Overall, working non-traditional hours can cause SWSD by disrupting the body's natural alignment with its 24-hour sleep-wake cycle, leading to difficulties in falling and staying asleep, as well as achieving high-quality sleep.
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Diagnosis: Requires symptoms for at least three months, with disturbed sleep-wake patterns for two weeks
If you suspect you have shift work sleep disorder (SWSD), it's important to consult a healthcare professional for a proper diagnosis. They will likely ask you to keep a sleep diary or journal for at least two weeks, detailing your sleep patterns and disturbances, sleep-wake cycles, and any factors that may impact your sleep, such as caffeine consumption or noise disturbances.
To receive a diagnosis of SWSD, you must report symptoms for at least three months, with disturbed sleep-wake patterns evident for at least two weeks. This duration is crucial to establish that the symptoms are persistent and not temporary due to other factors. The symptoms must also be consistent with your shift work schedule and cannot be attributed to other sleep disorders, medical conditions, medication side effects, substance abuse, or poor sleep hygiene.
To rule out other potential causes, your healthcare provider may also perform a physical examination and ask about your medical history and current medications. They may refer you for additional tests, such as actigraphy, which involves wearing a sensor on your wrist or ankle for 14 consecutive days to monitor your sleep-wake activities objectively. In some cases, a polysomnography, or sleep study, may be recommended, which typically takes place during the day instead of at night for shift workers.
It's important to note that not everyone who works shifts will develop SWSD, and there are strategies and treatments to manage the condition if you do receive a diagnosis.
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Treatment: Lifestyle changes, like a regular sleep schedule, naps, and limiting caffeine
If you are experiencing symptoms of shift work sleep disorder (SWSD), there are several lifestyle changes you can make to help manage the condition and improve your sleep quality.
Firstly, try to maintain a regular sleep schedule, even on your days off. This can be challenging when working irregular shifts, but consistency is key to regulating your body's sleep-wake cycle. If possible, take 48 hours off after a series of shifts to allow your body to recover and adjust.
Secondly, take advantage of strategic napping. Napping before or during your shift can decrease fatigue and increase your focus. However, be mindful of the timing and duration of your naps to avoid disrupting your nighttime sleep.
Thirdly, limit your caffeine intake, especially close to bedtime. While caffeine can provide a temporary energy boost, it may also disrupt your sleep when consumed late in the day. Try to drink caffeine early in your shift and avoid it towards the end to promote better sleep at night.
Additionally, minimise sun exposure when leaving work by wearing sunglasses. This helps prevent your body's "daytime" clock from activating and interfering with your nighttime sleep. Create a dark environment for sleeping using heavy shades or curtains, as light exposure significantly influences your sleep-wake cycle.
Finally, maintain a healthy diet and avoid long commutes if possible. A diet rich in fruits and vegetables can promote overall health and potentially improve your sleep quality. Long commutes, on the other hand, can cut into your valuable sleep time and contribute to drowsiness.
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Risks: Health, social, and safety concerns, including accidents, heart disease, and depression
Shift work sleep disorder (SWSD) is a chronic condition that affects individuals who work non-traditional hours, such as split shifts, graveyard shifts, early morning shifts, or rotating shifts. It is characterised by excessive sleepiness, a lack of refreshing sleep, and drowsiness, which can impact both work and leisure time. The disruption to a person's circadian rhythm or "biological clock" can lead to various health, social, and safety concerns.
Health Risks
SWSD can have significant implications for an individual's health due to the chronic sleep deprivation it entails. Sleep deprivation can increase the risk of falling asleep at the wheel, making errors on the job, and experiencing accidents at work or during commutes. It can also negatively impact heart health, digestive function, and cancer risk. Older workers and female workers are particularly susceptible to higher levels of sleep deprivation.
In addition, SWSD can lead to underlying health conditions or new issues such as high cholesterol, gastrointestinal problems, reproductive issues, and low testosterone. It may also increase the likelihood of getting sick frequently with colds or the flu.
Social Risks
The disorder can also have social implications, as it is associated with mood issues such as irritability and difficulty coping with conflicts. Individuals with SWSD are at a higher risk of depression and may turn to alcohol or drugs as a means of self-medication, potentially leading to substance use disorders.
Safety Risks
SWSD poses safety concerns due to the combination of fatigue and impaired concentration, which increases the risk of accidents in the workplace or while commuting. Several high-profile disasters, such as the Chernobyl nuclear plant meltdown in 1986 and the Exxon Valdez accident in 1989, have been attributed in part to work-related fatigue.
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Frequently asked questions
Shift work sleep disorder (SWSD) is a condition that affects people who work outside the hours of 6 am and 7 pm, including split shifts, graveyard shifts, early morning shifts, or rotating shifts. It is characterised by excessive sleepiness, lack of refreshing sleep, and drowsiness, which can affect both work and leisure time.
Shift work sleep disorder is caused by disruptions to the body's circadian rhythm or "biological clock", which regulates wakefulness and sleepiness throughout the 24-hour day. Working irregular hours can cause a mismatch between your circadian rhythm and the natural light and darkness cycles, leading to problems falling asleep, staying asleep, or getting high-quality sleep.
The average person with shift work sleep disorder loses one to four hours of sleep per night. This can lead to insomnia, excessive sleepiness during the day, fatigue, impaired concentration, and increased risk of accidents. Shift work sleep disorder can also cause social impairments, such as social isolation, irritation, and mood problems.
Shift work sleep disorder is typically diagnosed by a doctor using a specific set of tests and questionnaires, including a sleep history, sleep diary, and a test called actigraphy. To qualify for a diagnosis, a person should report recurring symptoms for at least three months and demonstrate disturbed sleep-wake patterns for at least two weeks.
