There is a stage of sleep that works like therapy. It takes the emotional sting out of the day while you are unconscious.

That stage is REM, your dreaming sleep. This issue first ran weeks ago, and it is worth another look, because what you do in the last hour decides how well it works. During REM your brain replays the day’s emotional moments. It does this in a chemical state unusually low in noradrenaline, the stress signal.

Replaying the memory without the stress chemical is the trick. The brain keeps the information and strips off the charge, so tomorrow the memory is a fact, not a wound.

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This is why things often feel smaller in the morning. Overnight, REM filed them without the heat they carried at midnight.

Now look at what you feed it in the last hour. The news, the work inbox, the upsetting show, the argument replayed on a screen.

Charged content right before sleep does two things. It raises your arousal so sleep comes harder, and it hands REM a fresh, hot pile of material to process.

Load enough of it in and the overnight filing cannot keep up. You wake with the day’s emotion still raw, the dread intact, the argument still live.

That is the morning that feels anxious for no clear reason. The night did not defuse what you handed it too late to sort.

The anchor is a study by van der Helm and colleagues in Current Biology. After a night with REM sleep, people’s brains reacted less strongly to emotional images, and the calming tracked with lower noradrenergic activity in REM.

It is a striking result and still a developing model. Treat the overnight-therapy idea as a well-supported direction, not a finished map.

Here is the move, and the precision matters. The problem is not screens as such, it is emotionally charged input in the last hour.

Keep the news, the work email, and the activating shows out of your final hour. A calm show or a dull book is fine, it is the charge you are avoiding, not the screen.

If something heavy landed today, deal with it earlier in the evening. Write it down an hour before bed rather than carrying it in hot.

Your brain will defuse the day for you overnight. Do not re-light it in the last hour and leave REM nothing but fires to put out.