Shift work sleep disorder: what employers can do

What shift work sleep disorder is

The body runs on an internal clock that makes us alert during the day and sleepy at night. Working nights, very early mornings or rotating shifts puts work hours out of step with that clock. Many shift workers adapt reasonably well, but some develop ongoing problems with sleep and alertness that are linked to their schedule. When these problems persist, a doctor may diagnose shift work sleep disorder. Employers should not try to diagnose employees, but they can recognize fatigue as a workplace risk and act on it. Our night shift guide covers night work more broadly.

Common signs

• Difficulty falling asleep or staying asleep after shifts.
• Excessive sleepiness during work hours.
• Short sleep, even when the employee has time to rest.
• Trouble concentrating, slower reactions and more mistakes.
• Irritability or low mood.
• Relying heavily on caffeine to stay alert.

These signs can have many causes. If an employee mentions ongoing sleep problems, encourage them to talk to a healthcare provider and treat any information they share as confidential.

Why it matters for employers

Fatigue is a recognized occupational hazard. Our workplace safety guide explains how to fold it into your safety program.

Scheduling practices that help

1. Rotate forward (day to evening to night) rather than backward when using rotating shifts.
2. Limit consecutive night shifts where possible, and give enough recovery days after a night block.
3. Protect rest between shifts. Avoid quick turnarounds such as clopenings.
4. Control overtime on night and long shifts, and track who works the most extra hours.
5. Publish schedules early so employees can plan sleep, childcare and family time.
6. Offer choice where you can: some people adapt to nights better than others, and fixed shifts can suit them.

Our guides to rotating schedules and 24-hour shift schedules discuss how pattern design affects fatigue.

Workplace steps that help

• Bright lighting in work areas during night shifts.
• Scheduled breaks, and allowing short rest breaks where safe and allowed by policy.
• Access to healthy food and water on night shifts, not just vending machines.
• Rotating demanding or high-risk tasks so no one does them for the whole shift.
• Extra care with safety-critical tasks in the last hours of a night shift.
• Information for employees on sleep habits for shift workers, such as dark, quiet rooms and consistent sleep times.

Accommodation requests

An employee with a diagnosed sleep disorder may ask for a schedule change, such as moving off nights or avoiding rotating shifts. Under the ADA and many state laws, employers with enough employees to be covered may need to consider whether the condition is a disability and whether a reasonable accommodation is possible without undue hardship. Handle requests through your normal accommodation process, keep medical information confidential and separate from personnel files, and document the discussion. The FMLA may also apply to time off for a serious health condition; see our FMLA guide.

Talking with an employee who seems fatigued

1. Speak privately and focus on what you have observed, such as near misses or falling asleep on break.
2. Ask how things are going and whether the schedule is causing problems.
3. Do not ask for a diagnosis or medical details.
4. If safety is at risk, remove the employee from safety-critical tasks for the moment.
5. Discuss practical options: a different shift pattern, fewer consecutive nights or less overtime.
6. Mention support such as an employee assistance program if you have one.

Commuting after night shifts

The drive home after a night shift is a common point of risk. Encourage employees to take a short rest before driving if they feel drowsy, consider carpooling arrangements and avoid scheduling overtime at the end of a long night run. Some employers offer a quiet room where employees can rest before leaving. Simple reminders about drowsy driving in team updates also help.

Policy checklist

• Maximum consecutive night shifts and minimum rest between shifts.
• Rules for overtime on night and long shifts.
• How employees can report fatigue without fear of discipline.
• What supervisors should do when an employee appears too tired to work safely.
• How schedule change and accommodation requests are handled.

Including these in your employee handbook or safety program makes expectations clear for everyone.

Supporting managers on night shifts

Night shifts often have fewer supervisors on site. Make sure the person in charge knows how to handle fatigue concerns, who to call for support and when to stop a safety-critical task. Regular check-ins between day managers and night leads help catch fatigue problems early, before they turn into incidents or resignations.

Use data to spot fatigue risk

Hours data shows where fatigue risk builds: long runs of consecutive shifts, short rest periods, heavy overtime and frequent schedule changes. EZTime’s attendance clock records actual hours, including overnight shifts, and scheduling software helps managers build patterns with enough rest and see overtime before it happens.

Frequently asked questions

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