Screen time before bed: how much sleep you're really losing
Screen time before bed usually gets blamed on blue light. But recent research points to something less convenient: the main harm isn't the screen's color but the minutes it quietly steals from your night. Let's count how much sleep disappears into the feed and put together a one-week "digital sunset" plan.
11:40 p.m. "Just five more minutes," and you open your feed. Two videos, one chat, a news story, another video. You switch off the screen, and the clock says 12:55 a.m. Sound familiar? You just lost more than an hour of sleep without even noticing where it went.
We're used to blaming blue light and switching on night mode with a sense of accomplishment. But research from recent years points to something simpler and less convenient: above all, the screen steals time from your sleep.
Does screen time before bed affect sleep?
It pushes sleep later and makes it shorter. A study by Norwegian researchers published in 2025 in Frontiers in Psychiatry included 45,202 students aged 18–28.
Each hour of screen use after getting into bed was linked to 59% higher odds of insomnia and roughly 24 minutes less sleep. An important caveat: this is an observational study, not an experiment, and the authors say plainly that they can't determine whether screens disrupt sleep or whether people who sleep poorly reach for their phones more often. But the link is consistent, and very recognizable.
Why shouldn't you scroll before bed if night mode is on?
Because night mode changes the color, not the time. In the same study, social media was no worse than other screen activities such as movies, games or reading on a screen. What mattered was the total time the screen took away from sleep.
And the phone is almost always within reach. According to surveys by the AASM, the leading U.S. professional society of sleep specialists, 87% of Americans sleep with their phone in the bedroom, and 91% admitted to staying up late binge-watching shows. More on blue light itself in "Blue light and sleep".
In the PDF for this article, we've put together a 7-day "digital sunset" plan: how to count your lost minutes, an evening tracker and a list of phone replacements, so the habit changes gradually, without heroics.