Night worker health assessment
A free health assessment your employer must offer if you work nights, to check that night work is not harming your health.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Your employer must offer it free if you work nights, under the Working Time Regulations — it is for your protection.
- It is usually a confidential health questionnaire, focused on how night work affects sleep, mood, diet and existing conditions.
- It is offered before you start night work and at regular intervals; you can decline, but it is sensible to take it up.
- If night work is harming your health, your employer should, where possible, offer day work or adjustments — your medical detail stays confidential.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Checks that night work is not harming your health.
Treating it as a general medical or a fitness 'pass or fail' for most roles — it is protective and advisory.
You usually receive advice that night work is suitable, or suggestions for adjustments or follow-up.
Clear, practical advice on sleep, diet and managing shifts.
You usually receive advice that night work is suitable, or suggestions for adjustments or follow-up.
An occupational-health professional may review your answers and discuss adjustments or onward advice.
Your employer should, where possible, consider day work or changes to your shifts, based on the advice given.
You may be advised to see your GP for assessment or treatment.
What is a night worker health assessment?
A night worker health assessment is a free health check that your employer must offer you if you regularly work at night. Its purpose is to check that night work is not harming your health, and to pick up problems that night work can make worse. It is a workplace health assessment, not a treatment or a fitness 'pass or fail' for most jobs.
The duty comes from the Working Time Regulations 1998 (Regulation 7), enforced by the Health and Safety Executive (HSE). A 'night worker' is broadly someone whose normal working hours include at least three hours during the night period (usually 11pm to 6am). Your employer must offer the assessment before you start night work and then at regular intervals. You do not have to accept it, but it is there for your benefit and it is free.
There is no fixed format. It is often a screening questionnaire designed with advice from a qualified health professional, asking about things that night work commonly affects — sleep, tiredness, diet and digestion, mood, heart and blood-pressure health, and conditions such as diabetes or epilepsy that can be sensitive to disturbed routines. If something is flagged, a health professional may review it.
The assessment can find that night work is affecting your health. If so, and where possible, your employer should consider moving you to day work or making adjustments. The point is to protect your health, not to catch you out — and your medical detail stays confidential.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Night worker assessment vs a statutory fitness medical
| Point | Night worker assessment | Statutory medical (e.g. HGV, ENG1) |
|---|---|---|
| Main aim | Protect your health on nights | Decide fitness against a set standard |
| Who pays | Employer, free to you | Usually a fee |
| Can you decline? | Yes | No, if the licence needs it |
| Typical outcome | Advice or adjustments | Fit, restricted, or not fit |
For most roles this is protective rather than pass/fail, though some safety-critical jobs combine it with a statutory medical.
Preparing for your test
- Check whether your hours make you a 'night worker' (normally at least three hours of work between 11pm and 6am on a regular basis).
- Be ready to describe your sleep, energy, mood, appetite and digestion since starting or considering night work.
- Note any conditions that disturbed routines can affect, such as diabetes, epilepsy, heart conditions, mental-health conditions or sleep problems.
- Bring a list of your medicines, as timing on night shifts can matter (for example insulin or epilepsy medicines).
- Think about practical issues — commuting tired, caring responsibilities, caffeine and alcohol use.
- Remember the assessment is confidential and free, and is meant to help you work nights safely.
- Raise any concerns about how night work is affecting you — that is exactly what it is for.
What happens
Most often you complete a confidential questionnaire about your health and how night work affects you — sleep, tiredness, diet and digestion, mood, and any existing conditions and medicines. The questionnaire is usually designed with advice from a qualified health professional.
If your answers raise a concern, an occupational-health nurse or doctor may review them, sometimes with a short conversation or examination. They consider how shift work interacts with your health and with the timing of any medicines.
The outcome is usually advice rather than a 'pass or fail': that night work is suitable, that some adjustments would help (for example shift patterns, breaks, or help with sleep and diet), or that night work may not be suitable for you at the moment. Where night work is found to be harming your health, your employer should, where possible, consider moving you to day work. The health professional shares advice and any recommended adjustments with your employer, not your private medical detail.
Is this test right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- Treating it as a general medical or a fitness 'pass or fail' for most roles — it is protective and advisory.
- Using it instead of seeing your GP for a health problem that needs assessment or treatment.
- Assuming it removes your employer's wider duties to manage fatigue and shift design.
- Relying on a single assessment indefinitely, when the effects of night work build over time.
Delay or rearrange if…
- You are acutely unwell and should see your GP first.
- You have a current mental-health crisis or thoughts of self-harm — seek urgent help rather than waiting for a routine assessment.
- Your condition (such as diabetes or epilepsy) is currently unstable and needs medical review first.
- You cannot give an accurate picture because you have only just started shifts — a short follow-up may be more useful.
- There are urgent safety concerns (such as falling asleep at the wheel) that need raising immediately, not at the next routine review.
Alternatives to discuss
- Asking your GP to review how shift work affects an existing condition.
- Requesting adjustments to shift patterns, breaks or duties through your employer.
- Fatigue-management and sleep advice without a full assessment.
- A move to day work where night work is clearly unsuitable.
- Occupational-health referral for complex or recurring problems.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Checks that night work is not harming your health.
- Can pick up problems early, such as poor sleep, low mood, or high blood pressure.
- Gives practical advice on sleep, diet, caffeine and managing shifts.
- Helps make sure medicines (such as insulin or epilepsy treatment) are timed safely around shifts.
- Can lead to helpful adjustments, or a move to day work, if night work is affecting you.
- Keeps your medical detail confidential while letting your employer act on advice.
Risks & complications
- Realising night work is affecting your sleep, mood or health more than you thought.
- Being asked follow-up questions or to speak with an occupational-health professional.
- Being advised to make changes to sleep, diet or shift habits.
- Spending a little time completing the questionnaire or attending a short appointment.
- Being advised that adjustments to your shifts are needed.
- Being referred to your GP for a newly identified problem such as high blood pressure or low mood.
- Being advised that night work may not be suitable for you at present.
- A finding that night work is significantly harming your health, prompting a move to day work where possible.
- Discovering a serious condition (for example uncontrolled diabetes or a heart problem) needing prompt care.
Night work can worsen sleep disorders, mood, and conditions like diabetes, epilepsy and heart disease, partly through disturbed routines and the timing of medicines. The assessment is protective, but its value depends on honesty. If you have a condition affected by shift patterns, ask how your medicines should be timed and what adjustments could help. If night work is clearly harming you, ask what alternatives or day-work options exist.
Published figures to discuss
There is no meaningful complication rate for this assessment, because it is a screening and advice process rather than a procedure. How often night work is found to be affecting health varies widely by job, shift pattern and individual, and is not published as a single reliable figure. We therefore avoid quoting a percentage and describe outcomes in plain terms instead.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Sleep disruption and fatigue | Common with night work | Fatigue can affect safety, driving home, mood and long-term health. | Guide sourcesClinical context |
| Condition worsened by night work | Recognised | Diabetes, epilepsy, sleep disorders, mental-health conditions, pregnancy and some medicines may need individual advice. | Guide sourcesClinical context |
| False reassurance from questionnaire only | Recognised | New symptoms, accidents, near misses or medication changes should prompt review. | Guide sourcesClinical context |
| Work-design issue missed | Common | Shift rotation, rest breaks, consecutive nights and commute risk are workplace controls, not purely medical issues. | The Working Time Regulations 1998, Regulation 7 (legislation.gov.uk)legislation.gov.ukSource-linked context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
There is no physical recovery. 'Afterwards' is about the advice you receive and any adjustments to your work.
- Getting practical advice rather than a 'pass or fail' is normal for most roles.
- Being asked follow-up questions or to speak with a health professional is routine.
- Being offered the assessment again at intervals is expected.
- Feeling that night work affects your sleep or energy is common and worth raising.
Aftercare
- Follow any advice on sleep, diet, caffeine and managing your shifts.
- If medicines need re-timing around night shifts, agree a plan with your GP or pharmacist.
- If a health problem was found, see your GP and follow the plan.
- Take up the repeat assessment when it is offered.
- Tell your employer or occupational-health service if night work starts to affect your health.
- Keep a note of any advice or recommended adjustments.
- Remember you can ask about day work or adjustments if night work is harming you.
- Honest notes on your sleep, mood and energy
- List of medicines and their usual timing
- Details of any conditions affected by shift work
- Questions about adjustments or day work
- Your employer's process for occupational-health referral
- Any advice given on sleep and diet
- A reminder of when the next assessment is due
⚠ Get urgent help if…
- Falling asleep at work, while driving, or commuting — raise this urgently.
- Severe, persistent insomnia or exhaustion that does not improve.
- Low mood, hopelessness or thoughts of self-harm — seek help promptly.
- Chest pain, severe breathlessness or palpitations — seek urgent medical care.
- Repeated very high or very low blood sugars if you have diabetes on shifts.
- Seizures or blackouts, especially if shift patterns affect your epilepsy control.
- Any condition that is clearly getting worse since starting night work.
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
A good outcome is usually clear advice that night work is suitable for you, perhaps with practical tips on sleep and diet, or sensible adjustments. Where night work is affecting your health, the outcome is advice on adjustments or, where possible, a move to day work.
The assessment cannot guarantee night work will suit you indefinitely, and it does not replace seeing your GP for health problems. Its value is in catching issues early and giving you and your employer a basis to act. Taking up the repeat assessments matters, because the effects of night work can build up over time.
This is not a one-off. Your employer should offer the assessment before you start night work and at regular intervals afterwards, because the effects of shift work can develop over months and years. If your health or shift pattern changes, it is worth seeking a review rather than waiting for the next routine offer.
Related tests, treatments or support
For most workers this assessment stands alone as a protective check. For some safety-critical night roles (for example certain driving or process-safety jobs), it may be combined with a statutory fitness medical. Advice on sleep, fatigue management and shift design is often provided alongside it.
Follow-up & long-term care
If night work is suitable, the next contact is your repeat assessment. If a concern is flagged, occupational health follows up with advice or a review. If a health problem is found, your GP arranges assessment or treatment, and your employer acts on any recommended adjustments.
- Keep good sleep, diet and caffeine habits around your shifts.
- Keep long-term conditions reviewed, with medicine timing adjusted for night work where needed.
- Take up repeat assessments when offered.
- Seek a review if your health or shift pattern changes.
Repeat, follow-on and what comes next
- Being asked follow-up questions or to speak with a health professional is common and is not a failure.
- Advice or adjustments, rather than a clear 'pass', are the usual outcome.
- The assessment is repeated at intervals because the effects of night work can develop over time.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- Clear, practical advice on sleep, diet and managing shifts.
- A plan for timing medicines safely around night work where relevant.
- Signposting to your GP if a health problem is found.
- A route to adjustments or day work if night work is harming your health.
- Confidential handling of your health detail, sharing only advice and adjustments with your employer.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- This assessment is free to you — your employer must provide it under the Working Time Regulations.
- For the employer, cost depends on whether a questionnaire or an occupational-health service is used.
- Whether a health professional reviews flagged answers or sees you in person.
- Whether any onward tests or referrals are needed (usually via the NHS).
- How often re-assessments are offered.
- Confirmation that the assessment is free to you as the worker.
- Whether it is a questionnaire or an occupational-health assessment.
- What information is shared with your employer and what stays confidential.
- What adjustments or follow-up are available if a concern is found.
- How often the assessment will be repeated.
- Who to contact if night work starts to affect your health between assessments.
On the NHS? This is an employer duty provided free under the Working Time Regulations rather than NHS care; the NHS still treats any health problem the assessment uncovers.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Not being clear that it is voluntary and that your medical detail stays confidential.
- Sharing private medical detail with an employer rather than just advice and recommended adjustments.
- Not being told you can usually see a report before it is shared and correct factual errors (Access to Medical Reports Act 1988).
- Pressure to under-report problems for fear of losing night-shift pay.
- No clear route to adjustments or day work if night work is harming your health.
Marketing red flags
- Charging the worker for an assessment that the employer must provide free.
- Selling it as a pass/fail 'fitness certificate' when it is protective and advisory.
- Promising it will 'prove' someone is fit for any shift pattern.
- Vague pricing or unnecessary add-on tests.
- Suggesting confidential health detail will be shared with managers.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- Based on my answers, is night work suitable for me at the moment?
- What adjustments to my shifts, breaks or routine would help my health?
- How should I time my medicines around night shifts?
- How is night work affecting my sleep, mood or existing conditions, and what can help?
- If night work is harming my health, what day-work or adjustment options exist?
- How often will I be offered this assessment again?
- What information goes to my employer, and what stays confidential?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my test, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this test not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Does my employer have to offer this?
Do I have to take it?
Who counts as a night worker?
Can I be sacked if night work doesn't suit me?
Will my employer see my medical details?
Is it available on the NHS?
What if I take regular medicines?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: The Working Time Regulations 1998, Regulation 7 (legislation.gov.uk) Acas — Night workers and working time rules HSE — Working hours and shift work NHS — How to get to sleep (shift work and sleep) Society of Occupational Medicine — about occupational health Access to Medical Reports Act 1988 (legislation.gov.uk)
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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