Frame it around output rather than hours, name one change, and put it in writing. You also have more standing than you think: every employee has a legal right to request flexible working.
Say one sentence about output, name one change, and put it in an email afterwards. "I'm going offline at seven from Monday. Nothing changes about what I deliver, and if something can't wait, ring me." That is the whole conversation. You are not asking permission to have an evening, you are telling someone how you work.
The dread here is usually about the career cost. Worth knowing that you have more standing than you think.
Why this conversation feels bigger than it is
Because you have already had it a hundred times in your head, with a version of your manager who reacts badly. That version is usually worse than the real one.
Two things inflate it. First, if you have been reachable at all hours for years, you assume that availability is what people value about you, and that removing it removes your value. Usually it is not what they value, and nobody has ever said it is. Second, saying it out loud makes it real, and part of you would rather keep the option of quietly going back to how it was.
There is also a practical reason to say it rather than just do it. If your team does not know your hours, they will keep messaging at eleven, you will keep seeing it, and every night you will spend energy deciding not to answer. That is the work moving from your inbox into your head. A boundary nobody knows about is not a boundary, it is a nightly test of character.
What you actually have a right to
Not everything is a favour.
**Flexible working.** GOV.UK is unambiguous: "All employees have the legal right to request flexible working." A request can cover "the number of hours they work, when they start or finish work, the days they work, or where they work". That is a formal route with an obligation on the employer to consider it, and it exists whether or not you have a sympathetic manager.
**The 48-hour week.** "You cannot work more than 48 hours a week on average", normally averaged over 17 weeks. You can agree to work more, but it "must be voluntary and in writing", and "Your employer can ask you to opt out, but you cannot be sacked or treated unfairly for refusing". If you signed one years ago, you can undo it: "You can cancel your opt-out agreement whenever you want, even if it's part of your employment contract", giving at least seven days' notice, or up to three months if your agreement says so.
**A workplace that assesses its own risk.** The Health and Safety Executive states it plainly: "Employers have a legal duty to protect employees from stress at work by doing a risk assessment and acting on it." Its Management Standards cover demands, control, support, relationships, role and change. If the honest problem is demands or control, those are the words to use, because they are the employer's own vocabulary.
You do not have to lead with any of this. Most conversations never need it. It is there so you go in knowing the floor is not as far down as it feels.
Frame it around output, not hours
Managers hear "I want to work less" as "I will deliver less" unless you tell them otherwise. So tell them, in the first sentence.
Three shapes that work:
"I've been checking messages all evening and it's making my mornings worse. I'm stopping at seven from Monday. Nothing's changing about what I deliver."
"I want to protect Tuesday and Thursday evenings. If that means moving something in the week, tell me what and I'll move it."
"I'm going to stop answering at weekends unless we're in an incident. If something is genuinely urgent, ring me."
Notice what is missing. No apology, no long explanation, no diagnosis. You do not owe your employer an account of why. "It's making my mornings worse" is enough and it is true.
Give people a phone-call escape hatch. It sounds like a weaker boundary and it is a stronger one, because almost nobody rings, and the ones who do had something real.
Handle the four replies you are likely to get
**"Of course, that's fine."** The most common answer, and the one people are least prepared for. Take it, thank them, and send the email anyway so it exists in writing.
**"We're really busy at the moment though."** Agree with the fact and hold the change. "We are. This is how I'll be working through it. If something specific is going to slip, tell me which and we'll pick." That moves the conversation to prioritisation, which is their job.
**"Everyone else manages."** Do not argue about everyone else. "This is what I need to keep doing good work here." Repeat it once, unchanged. Most pressure of this kind is testing whether you will restate it.
**Genuine hostility.** Rare, and if it happens, it is information. Put the request in writing, use the formal flexible working route, and keep a dated note of what was said. If the reaction to a reasonable boundary is a threat, you have learned something useful about whether the job is the problem, which is the subject of [Workaholics Anonymous, therapy or a new job](/guides/work/workaholics-anonymous-therapy-or-a-new-job).
Put it in writing afterwards
Short email, same day, no drama. Something like:
"Following up on what we said: from Monday I'm offline after 7pm and at weekends. Anything that lands after that I'll pick up first thing. If something can't wait, ring me and I'll answer. Happy to review in a month."
Three reasons this matters. It stops the change being renegotiated from memory in six weeks. It tells the wider team without you having to tell each of them. And offering a review date makes it easy to say yes to, because nobody is agreeing to anything permanent.
For the colleague who messages late without expecting an answer, one line settles it: "Happy to reply in the morning, I just don't see these after seven." Most late messaging is someone clearing their own head before bed.
If there is no manager to tell
**Self-employed.** Your version is telling clients, once, in writing. Hours in the email signature and the onboarding note, an auto-reply outside them saying when you will respond, and a separate work number or a business line app that mutes on a schedule. Watch for the trap specific to working for yourself: every hour not worked feels like money not earned, which prices rest as a loss. That sum never balances, because there is always another hour available.
**You are the manager.** Then you are also the person setting the norm for everyone below you. Schedule-send your evening emails. People read a message from their boss at 11pm as an expectation, whatever the words say.
After the conversation, the harder part
The relief usually lasts about four days. Then the first evening arrives where nothing is stopping you and you feel worse rather than better, and the temptation is to conclude it was a mistake. It is not a mistake, it is the normal shape of the first fortnight, and [the first week of actually stopping](/guides/work/the-first-week-of-actually-stopping) covers what to expect.
Renovyn can log whether the cut-off held and let someone you trust see it. That is a tracking tool, not treatment.
If any of this leaves you struggling to cope, SMART Recovery UK runs free meetings on 0330 053 6022, and the Samaritans are on 116 123, free, at any hour.
Common questions
**Do I have to tell my manager why?** No. "It's affecting my sleep and my mornings" is a complete reason and you are not obliged to go further. If you want a formal, documented change to hours or location rather than an informal one, the flexible working route is designed for that and does not require a medical explanation either.
**Will this damage my career?** Being unavailable in the evening rarely does. Being unreliable does, and so does burning out and disappearing for three months. Most managers care about whether the work lands and whether they can predict you. Predictable hours are easier to work with than heroic ones.
**What if my job genuinely needs out-of-hours cover?** Some do. Make the on-call window explicit, compensated and finite, and let everything outside it be properly off. The thing eating your evenings is usually not the rota, it is ambient availability that nobody ever agreed to. If the rota effectively has you on call every night, that is a staffing problem worth naming.
**Can my employer make me work more than 48 hours a week?** Not on average without your written agreement, and you cannot be sacked or treated unfairly for refusing to sign one. If you have already signed, you can cancel it with at least seven days' notice, or up to three months if that is what your agreement specifies.
Sources
[GOV.UK, Flexible working](https://www.gov.uk/flexible-working): Every employee's legal right to request flexible working, and what a request can cover.
[GOV.UK, Maximum weekly working hours](https://www.gov.uk/maximum-weekly-working-hours/weekly-maximum-working-hours-and-opting-out): The 48-hour average limit, the voluntary written opt-out, protection from being sacked for refusing, and how to cancel.
[HSE, What are the Management Standards?](https://www.hse.gov.uk/stress/standards/overview.htm): The employer's legal duty to assess work-related stress, and the six areas.
[NHS, Addiction: what is it?](https://www.nhs.uk/live-well/addiction-support/addiction-what-is-it/): The definition of addiction, work named directly, and the Samaritans line.
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