Sleep-In Shift Pay UK: Care Worker Rights, NMW & 2024 Rules

Sleep-in shifts are a common part of UK care work. The rules around how they're paid have been disputed for years and were clarified by the Supreme Court in March 2021. This guide explains the current legal position, what your payslip should look like, and what to do if you suspect under-payment.

What is a "sleep-in" shift?

A sleep-in shift is a period (usually overnight) where a care worker is required to be at the workplace and available to assist if needed, but is otherwise expected to sleep. Common in residential care homes, supported-living settings, and some domiciliary care arrangements.

A sleep-in is not the same as a "waking night" shift, where the worker is expected to be awake and active throughout the period. Waking nights are unambiguously hours of work and must be paid at least National Minimum Wage (NMW) for every hour.

The Mencap Supreme Court ruling (March 2021)

In Royal Mencap Society v Tomlinson-Blake [2021] UKSC 8, the Supreme Court ruled that:

• Sleep-in shift workers are not entitled to NMW for the time they are asleep.
• They are entitled to NMW only for time spent actually working (e.g. responding to a resident, paperwork, handover).
• A flat "sleep-in allowance" is permitted, provided that any time actually worked during the shift is separately paid at no less than NMW.

This reversed a body of lower-court rulings that had treated the entire sleep-in period as working time. The Supreme Court's reasoning: the worker is "available for work" during sleep but not actually working in the sense Parliament intended for NMW.

What this means for your payslip

A typical UK sleep-in shift in 2026/27 pays:

• A flat sleep-in allowance for the overnight period (commonly £30-£60 in the care sector - varies by employer and locale).
• Plus NMW or higher for any hours actively worked during the shift, if the worker is woken to provide assistance.

For example, an 8-hour sleep-in starting at 11pm:

Sleep-in allowance (flat):                £45.00
Plus 1 hour of active work at 1am:        £12.21  (NMW 21+ in 2026/27 = £12.21/hour)
Total for the sleep-in period:            £57.21

If the worker is woken multiple times (e.g. supporting a resident with high need), the active-work portion stacks. Three hours of active work + 5 hours of sleep = £45 allowance + 3 × £12.21 = £81.63.

What the law requires your employer to do

1. Itemise the sleep-in allowance separately on the payslip - it must not be hidden in the basic-pay line.
2. Itemise active hours separately - if you were woken to work, those hours must show as a distinct line at NMW or higher.
3. Maintain a record of when active work occurred - typically a "sleep-in disturbance log" or similar. You should be able to access it on request.
4. Apply the correct NMW rate for your age band (in 2026/27: £12.21 for 21+, £10.00 for 18-20, £7.55 for under-18s and apprentices in their first year).

Common patterns of under-payment

1. Flat allowance only, with no provision for active hours. If you've been woken to work and your payslip shows only the flat allowance, you've been underpaid.
2. Allowance below the implicit NMW for active hours. If your contract pays a £30 sleep-in allowance and assumes 0 active hours, but you average 2 hours of active work per shift, your effective rate for those hours is £15 - which clears NMW only because the £30 covers more than just active work. Confirm in writing with your employer how active hours are calculated.
3. Sleep-in allowance below the going rate. Not unlawful per se, but worth comparing against the local market and your union's published rates.
4. No active-hours record kept. If you're woken regularly and your employer doesn't track it, you have no evidence - start logging it yourself in writing immediately.

Holiday pay on sleep-ins

Sleep-in pay (both the allowance and the active-hours element) counts towards the 52-week average for holiday pay under the post-2024 rules - see our holiday pay guide. If your holiday pay looks low and your work pattern includes sleep-ins, the average should reflect them.

Tax treatment

Both the sleep-in allowance and the active-hours pay are ordinary employment income, taxed under PAYE. There's no special tax treatment for sleep-in pay. NIC applies as normal.

The fact that the allowance is "flat" rather than hourly doesn't change its tax treatment - it's still earnings from employment.

Sleep-ins and the Working Time Regulations

The Working Time Regulations 1998 give workers a right to:

• 11 consecutive hours of rest per 24-hour period - sleep-ins generally count as rest if there's no actual work.
• 24 consecutive hours of rest per week (or 48 hours per fortnight).
• A 20-minute break for every 6+ hours worked.

If you do active work during a sleep-in, the rest-period clock can break. Talk to your manager or your union about how this is handled in your workplace - it can affect your maximum-hours calculation across the week.

What to do if you suspect under-payment

1. Document. Log every active-work disturbance with date, time woken, time slept again, what you did. Keep this somewhere your employer can't access.
2. Email payroll. Ask for the figure-by-figure breakdown of how your sleep-in pay was calculated for the relevant period(s).
3. Cross-reference your log. If active hours weren't paid, raise it formally.
4. Contact your union. UNISON, GMB and Unite all have substantial sleep-in shift case experience and can support a claim.
5. Acas early conciliation. 0300 123 1100. Free, confidential, and a precondition for an Employment Tribunal claim.

NMW under-payment claims have a six-year limitation under the Limitation Act 1980 (longer than the two-year wages-claim limit) so historical claims can sometimes go back further than you'd expect.

Where to escalate

Issue	Try first	If unresolved
Active hours unpaid	Payroll, in writing	HMRC NMW enforcement (gov.uk/pay-and-work-rights-helpline)
Sleep-in allowance below local norm	Your union; review the market	Negotiate at contract renewal
Active-hours log inaccurate	Document it yourself; raise with manager	Acas if persistent
Multiple workers affected	Your union - collective claim	Employment Tribunal

The HMRC National Minimum Wage enforcement team can issue notices of underpayment to employers and recover up to 6 years of arrears for affected workers, including a penalty.

Disclaimer

PayslipIQ provides automated educational guidance based on the figures you supply. It is not regulated employment-law advice. Sleep-in shift law is complex and the Mencap ruling is only the most recent of many decisions; for a substantial back-pay claim, consult Acas, your union, or an employment solicitor.