You scroll for an hour, put the phone down, and your head feels full of static. Reading a paragraph takes effort. A simple decision feels heavy. Words come a beat late.
So can doomscrolling cause brain fog? Probably, in the sense that it feeds the things that produce that feeling. But "brain fog" is a description, not a diagnosis, and the studies here do not measure doomscrolling and brain fog together. What follows is what the research does support, kept to what it actually says.
Is brain fog a real thing, or just a feeling?
It is a real experience with no single definition. People use it for slower thinking, poor concentration, forgetfulness and mental tiredness.
Those are all things researchers can measure separately: attention, self-control, memory, fatigue and sleep. That is the useful way to ask the question. Does heavy phone use move any of those? The evidence says it plausibly does, with limits on how firmly.
Can heavy short-form video use hurt attention?
It is linked to it. The strongest evidence is a meta-analysis, not a single study.
Nguyen and colleagues (2025, Psychological Bulletin) pooled 71 studies covering about 98,299 people. Heavier short-form video use was linked to poorer attention and, most strongly, poorer inhibitory control, which is the ability to hold back an impulse. It was also linked to more stress and anxiety.
This is correlational. It cannot tell you whether scrolling wears down attention, or whether people with weaker attention scroll more, or both. Still, it fits the shape of the complaint: a mind that struggles to stay on one thing.
Source: Nguyen et al. (2025), Psychological Bulletin.
Is there evidence that cutting back on the phone helps?
There is one randomised trial worth knowing about, though it did not measure brain fog or doomscrolling.
In a randomised trial, Castelo and colleagues (2025, PNAS Nexus) blocked mobile internet on 467 people's smartphones for two weeks. Calls and texts still worked. The block improved sustained attention, mental health and subjective wellbeing. The attention gain was comparable to about 10 years of age-related decline. Increased nightly sleep was one of the mechanisms.
Two cautions. The block was imposed by the study. And it measured attention, mental health and wellbeing, so it shows that less mobile internet helped those outcomes, not that any particular routine will clear brain fog.
Source: Castelo et al., PNAS Nexus, 2025.
Do notifications and constant checking add to the haze?
They seem to. Fournier and colleagues, in Computers in Human Behavior, found that social media notifications during a focus task caused a brief slowdown in processing. The size of the effect tracked notification volume and checking habits rather than total screen time.
That matters for the feeling of fog, because it suggests the cost is in the interruptions, not only the hours. A day of small, repeated breaks in focus can leave you feeling scattered even if no single one registers.
There is also the phone's mere presence. In one study, Ward and colleagues (2017) found people did best on working-memory and fluid-intelligence tests with their phone in another room, and worst with it on the desk, even when it was silenced and unused. Later replications found smaller or mixed effects, so treat this as suggestive.
Source: Ward, Duke, Gneezy & Bos (2017), Journal of the Association for Consumer Research.
Does scrolling make you mentally tired?
One survey points that way, though it is early and it was not about doomscrolling. A survey of 439 people (Batmaz, Özsağır & Arslan Şekkeli, 2026, Psychological Reports) linked "brain rot", described as cognitive fatigue, to depression indirectly, through burnout and then stress and anxiety.
That is a survey, so it shows association, not cause. But the content of doomscrolling is worth noting. Bad news keeps the mind alert and worried while you sit still, which is plausibly tiring. That part is observation, not a finding, but many people will recognise it.
Source: Batmaz et al. (2026), Psychological Reports.
Is sleep part of the picture?
It is the easiest link to act on.
A 2025 meta-analysis in Frontiers in Psychiatry pooled 21 cohort studies covering 548,338 people. Each extra hour of daily screen time was associated with a bedtime about 13.2 minutes later, roughly 3 to 5 minutes less sleep, and higher odds of difficulty falling asleep.
Late-night scrolling is the classic version of this. You are tired, so you scroll, so you sleep less, so you are foggier tomorrow. Nothing about that requires a mysterious effect on the brain. Tired minds are foggy minds.
Source: He et al. (2025), Frontiers in Psychiatry.
What does the research not tell us?
A few honest limits:
- No study here measures doomscrolling specifically. The evidence is about short-form video, phone use, notifications and screen time.
- Most of it is correlational, so the direction of cause is open.
- Brain fog also has many causes that have nothing to do with phones, including poor sleep, stress, illness and some medications. If it is persistent or comes with other symptoms, it is worth raising with a doctor rather than assuming your phone is the whole story.
What can you do about it?
A few practical things, offered as advice rather than findings:
- Protect the last hour before bed. Given the sleep link, this is the highest-value change for most people.
- Cut interruptions before cutting hours. Turn off notifications from the apps that pull you back, and put the phone in another room while you do focused work.
- Try a fortnight, not a forever. The trial that showed gains ran for two weeks. A defined, short experiment is easier to start than a permanent rule.
- Notice how you feel after, not during. Scrolling can feel fine in the moment and leave you foggy ten minutes later. That gap is useful information.
If you want help holding the line, Boredom blocks the apps and puts a short guided reset in the gap. But the phone's own settings are enough to try this.
The short version
Doomscrolling is unlikely to be the only cause of brain fog, but it plausibly feeds it through poorer attention, constant interruption, worse sleep and mental fatigue. The best causal evidence we have says that reducing mobile internet for two weeks improved sustained attention and wellbeing.
The fog is not a character flaw. Start with sleep and notifications, give it two weeks, and see what changes.