shift work health risk reduction

Overview

Shift work means working outside the usual daytime hours — for example, evenings, nights, or rotating shifts. This type of schedule can disrupt your body's internal clock, which controls sleep, hunger, and energy. Over time, this can raise your risk for certain health problems, but there are many steps you can take to protect yourself.

Yes. Millions of people worldwide work shifts in healthcare, emergency services, transportation, factories, hospitality, and other industries.

Anyone who works night shifts, early morning shifts, rotating shifts, or long and irregular hours can be affected. Age, overall health, and how quickly your body adjusts to schedule changes also play a role.

Symptoms

Common symptoms

• Feeling very sleepy when you need to be awake
• Trouble falling asleep or staying asleep during your daytime rest period
• Fatigue and tiredness that does not go away
• Trouble concentrating or remembering
• Mood changes, irritability, or low mood
• Digestive problems like indigestion, stomach ache, or irregular bowel habits

Causes

Main causes

• Working during the body's natural sleep time
• Disruption of the 24-hour circadian rhythm
• Insufficient sleep and poor sleep quality
• Irregular meal times that affect hunger and blood sugar
• Limited exposure to natural daylight, especially for night workers

Risk factors

• Rotating shifts that change frequently
• Working more than three night shifts in a row
• Fewer than two full days off after a series of night shifts
• Long commuting time
• Older age
• Existing health conditions like diabetes, heart disease, or depression
• High stress at work or home

When to see a doctor

See a doctor urgently if:

• Falling asleep while driving or at work
• Chest pain or shortness of breath
• Feeling faint or dizzy
• Being awake more than 48 hours and unable to function

Book a routine appointment if:

• Persistent trouble sleeping for more than three days a week
• Daytime exhaustion that affects your safety or quality of life
• Mood changes, anxiety, or low mood that last for a few weeks
• Digestive problems that do not improve with eating habits changes
• High blood pressure readings at home or at work

Diagnosis

A doctor will ask about your work schedule, sleep patterns, symptoms, and daily habits. You may be asked to keep a sleep diary for one or two weeks. In some cases, a sleep specialist may recommend a sleep study to look for other sleep disorders.

Tests that may be done

• Sleep diary or app tracking your sleep and work hours
• Questionnaires about sleepiness, mood, and fatigue
• Physical exam and blood pressure check
• Blood tests to rule out other causes like thyroid problems or low iron
• Polysomnography (a sleep study) if another sleep disorder is suspected

What to expect at your appointment

Most of the time, no devices are needed. Your doctor will mainly use your descriptions and a sleep diary to understand your pattern. Be honest about your schedule and symptoms so you get the best advice.

Treatment

Treatment focuses on helping your body adjust to your work schedule, improving the quality and timing of your sleep, and managing any related symptoms. Your doctor, nurse, or occupational health team can guide you.

Self-care at home

• Take short planned naps before night shifts or during long shifts (when allowed)
• Create a dark, quiet, cool bedroom for daytime sleep
• Use blackout curtains, sleep masks, and earplugs
• Keep a regular sleep schedule, even on days off
• Avoid caffeine in the last half of your shift
• Limit alcohol, which can disrupt sleep
• Expose yourself to bright light during the start of your shift and limit light before your daytime sleep

Medical treatments

Treatment approaches may include cognitive behavioral therapy for insomnia (a type of talking therapy that changes unhelpful thoughts and habits), light therapy, and, when needed, short-term prescription treatments to help with sleep or alertness. Any medication must be discussed with a doctor who knows your full health picture, because these treatments can have side effects and are not recommended for everyone.

When is surgery considered?

Surgery is not used for shift work health risks.

Living with this condition

Protect your sleep as if it were a medical prescription. Use a consistent wind-down routine, tell friends and family about your sleep time, and put your phone away during your rest period. Keep meals light and eat at consistent times that fit your shift.

Lifestyle tips

• Plan your shifts in advance and try to keep a similar schedule each day
• Get regular physical activity, but avoid intense exercise right before your sleep time
• Use a 'short sleep' after a night shift only if needed — keep it under an hour and set an alarm
• Spend time outdoors on your days off and get natural light in the morning

Diet and exercise

Eat regular, balanced meals with whole grains, lean protein, and vegetables. Avoid heavy, greasy, or high-sugar foods during night shifts, as they can make fatigue worse. Keep water nearby and drink plenty of fluids. Regular aerobic exercise, like brisk walking, cycling, or swimming, can improve sleep quality and boost energy — but try to finish workouts at least a few hours before you need to sleep.

Mental health and emotional wellbeing

Shift work can make you feel isolated, stress, or low mood. These feelings are common and treatable. Talk to your partner, friends, or a counsellor. If you ever have thoughts of harming yourself, reach out for help immediately — even a phone call to a trusted person can make a difference.

Prevention

You cannot completely prevent the effects of working against your body's natural clock, but you can greatly reduce the risks. With good sleep habits, planned exposure to light, a healthy diet, and regular check-ups, many health problems linked to shift work can be avoided or caught early.

Vaccines

Vaccines do not directly prevent shift work health risks, but staying up to date on routine immunizations helps keep your immune system strong against infections.

Screening programmes

Regular health checks, including blood pressure, blood sugar, and cholesterol tests, are important for shift workers. These can catch early signs of conditions related to heart disease and diabetes.

Complications

If left untreated

• Ongoing sleep problems (chronic insomnia or excessive sleepiness)
• Increased risk of high blood pressure, heart disease, and stroke
• Higher risk of type 2 diabetes and unhealthy weight gain
• Depression and anxiety
• More workplace accidents and errors

Long-term outlook

The long-term outlook is generally positive when you take steps to protect your sleep and health. Many people successfully work shifts for years by making careful lifestyle choices and seeking medical advice early. Your body can adapt better than you think, especially with consistent habits and support.

Find support

International organisations

• World Health Organization ↗

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