Can't switch off? Write tomorrow down before bed

You turn off the light. And that's exactly when your brain gets going: the email you forgot to answer, tomorrow's meeting, the dentist appointment that needs rebooking. The harder you try to stop thinking, the more you think.

There's a trick that's almost absurdly simple. It takes a few minutes and needs nothing but pen and paper.

Why your brain won't let go

Unfinished things take up space. Your brain tends to keep whatever is started but not completed active in memory – like a tab that never closes. During the day you barely notice, because other things hold your attention. In the evening, when it goes quiet, only the tabs are left.

That's why the thoughts aren't random. They're reminders. Your brain is afraid you'll forget, so it rehearses. And a brain that's rehearsing is a brain that can't wind down.

The solution isn't to think it away. The solution is to give your brain a reason to stop reminding you.

What the research shows

A study from Baylor University (Scullin et al., Journal of Experimental Psychology: General, 2018) had participants sleep in a sleep lab. Five minutes before bed, half of them wrote a to-do list of everything they needed to get done over the coming days. The other half instead wrote down what they had already completed.

Those who wrote about tomorrow fell asleep faster than those who wrote about what was already done. And the more specific and longer the list, the faster they fell asleep.

That's the interesting part: you might expect a long list of unfinished tasks to make you more stressed. It was the opposite. Getting things down on paper seemed to act as a signal to the brain: this is saved, you don't need to hold it in your head anymore.

How to do it

1. Keep pen and paper by the bed. Not your phone. The screen pulls you into other things, and you shouldn't be looking at it now anyway.
2. Write for a few minutes before lights out. Everything you need to do tomorrow and over the next few days. Big and small, in any order.
3. Be specific. Not "work stuff" but "reply to Anna about the budget" and "rebook the dentist". The details are what let your brain let go.
4. Include what you can't solve yet. Those are usually the things that spin the most. Write them down anyway. Having them on paper is enough – you don't need a plan.
5. Put the pen down and turn off the light. You'll deal with the list in the morning. Right now it isn't your problem.

Make it a habit

Attach it to something you already do every night – after brushing your teeth, or when you get into bed. After a couple of weeks it becomes as automatic as setting your alarm.

Log in the app how quickly you fell asleep, or how calm you felt in bed. If it works for you, you'll see it soon enough. And if it doesn't, you've lost five minutes – not much for a test that could give you calmer evenings.