Why can't I stop thinking about work at night?

Mostly because your brain hasn't been told the work is handled. Unfinished tasks hang around in your head after you log off, and bedtime is the first quiet moment they get. In a study that followed 103 employees and 1,127 of their work goals, people had a harder time mentally letting go of unfinished goals than finished ones, especially goals they cared about. The fix that holds up best in the research is pretty boring: give those loose ends somewhere to go before you try to sleep.

Why it hits at bedtime

All day, something is competing for your attention. Meetings, messages, the next task, the drive home. Then you turn off the light and nothing is competing anymore, so your mind goes back to whatever is still open. The email you didn't answer. The comment your boss made at 3 p.m. The presentation on Thursday.

The frustrating part is that this kind of thinking rarely gets anywhere. You aren't solving the problem at 11:40 p.m. You're replaying it, maybe with a few new worst-case endings. Psychologists call that rumination, and it feels like work without producing any.

A few things make it worse:

• Checking email or Slack in bed. One quick look reopens every loop you were trying to close.
• No clear end to the workday. If you work from home, there's no commute to mark the switch. The laptop is twelve feet from the couch.
• Goals that are too big to finish. "Work on the Q1 plan" never feels done, so it never feels safe to put down.
• A real problem at work. A difficult manager, a layoff rumor, a job that's wrong for you. More on this below, because no bedtime trick fixes it.

Close the loops before you leave work

The study also tested a fix. Brandon Smit, the researcher, had some employees spend the end of the day writing a plan for each unfinished goal: where, when and how they'd finish it. For the people who usually had the hardest time switching off, that small step helped them detach from work in the evening. It made less difference for people who already switch off easily. If you're reading this at 11 p.m., you're probably in the first group.

Here's what that looks like in practice. In the last ten minutes of your workday, go through what's still open and write one line for each:

• "Budget stuff" becomes "Reply to Dana about the travel line, Tuesday 9:30, at my desk, right after standup."
• "Fix the deck" becomes "Redo slides 4 and 5, Wednesday morning, before I open email."

Smit also suggested setting smaller, concrete goals for the end of the day, so fewer things are left half done when you stop. "Send the draft to Priya" can be finished by 5. "Work on the draft" can't.

Cal Newport describes a version of this in his book Deep Work. He ends each day by checking his task list and calendar, then says "shutdown complete" out loud. It sounds a little silly. The point is to have a clear moment where work is officially over, so your brain doesn't have to keep checking.

At bedtime: the five-minute to-do list

If the loops are still open by the time you're in bed, write them down there too. In a 2018 study at Baylor University, researchers had 57 healthy adults aged 18 to 30 spend five minutes writing before lights out in a sleep lab. Half wrote a to-do list for the next few days. The other half wrote about tasks they had already finished. The to-do list group fell asleep significantly faster, and the more specific their lists were, the faster they fell asleep.

It was one night with young, healthy people, so it isn't the last word. But it costs nothing to try. A few tips:

• Use a paper notebook by the bed, not your phone. Your phone has your inbox on it.
• Be specific. "Call the vendor about the late invoice" beats "vendor."
• Stop at five minutes. This is for parking thoughts. The quarter can be planned at your desk.

When a work thought wakes you at 2 a.m.

Write it on the notepad in two or three words and put the pen down. You don't have to solve it or argue with it. It's on the list now, and the list has a time.

If you're still awake after about 20 minutes, the Sleep Foundation suggests you get out of bed and do something quiet, like reading a paper book, journaling or listening to music, and go back when you feel sleepy. It also says not to watch the clock. Lying there doing math about how many hours you have left until the alarm only adds a second thing to worry about.

Some people like a slow breathing exercise here, with the out-breath a little longer than the in-breath. It gives your attention something to do that isn't your inbox.

Start winding down earlier

Bedtime is the end of a chain that starts much earlier.

• Turn off work notifications after hours. Most phones can do this on a schedule. On an iPhone it's a Focus mode, and on Android it's Do Not Disturb or Bedtime mode.
• Make a fake commute. If you work from home, a ten-minute walk after you close the laptop gives your day an edge.
• Wind down before bed. The NHS recommends relaxing for at least an hour before bed and avoiding phones and TV right before you sleep.

When it's more than a busy week

Sometimes the thoughts keep coming back because something is genuinely wrong. A boss who makes every day tense. A workload no list can fit. A job you've known for a year isn't right. Writing a better to-do list won't settle that, and it's worth naming it plainly, even if only to yourself at first. After that, it might mean a direct talk with your manager, a call to HR, or a look at whether your employer offers an Employee Assistance Program. Many include a few free, confidential sessions with a counselor.

Pay attention to your sleep, too. The NHS says to see a doctor about insomnia if changing your sleep habits hasn't helped, if you've had trouble sleeping for months, or if it's affecting your daily life so much that it's hard to cope. A doctor may suggest cognitive behavioral therapy for insomnia, which works on the thoughts and habits that keep you awake. And if the worry has spread past work and you feel anxious most days, bring that to a doctor or a therapist too.

If you'd like something to talk it through with at 11 p.m., Moodu has guided conversations for exactly this, like Stress Stomping for a head full of work and Sleep Serenity for winding down, plus short breathing exercises. It's an AI companion and isn't a therapist. It won't answer your email for you, but it can be a place to set work down for the night.