Why focus slips
Focus is the everyday word for keeping attention on one task while ignoring what competes for it (What is attention? covers the science). A few research findings explain most of the advice in this guide.
Every switch has a cost
Juggling tasks feels productive, but lab research on task switching points the other way. When people alternate between simple tasks, their responses are substantially slower, and usually less accurate, just after each switch; having time to prepare shrinks this "switch cost" but does not remove it [1]. Those experiments used simple lab tasks, not real projects [1], so they cannot tell you how much a jump from email to a report costs.
Notifications pull attention even when you ignore them
In a lab experiment, receiving phone notifications during an attention-demanding task disrupted performance even though participants did not touch their phones, and the disruption was comparable in size to the effects seen when people actively use a phone for calls or texts [2]. The authors point out that even a short alert can set off thoughts unrelated to the task [2].
A phone on the desk matters less than you may have heard
A popular claim says that a smartphone merely lying nearby drains your thinking, even when it stays silent. Two meta-analyses have tested it. One pooled 33 studies with 4,368 participants and found no significant effect of a phone's mere presence on cognitive performance [3]. The other found a negative effect on working-memory capacity only, smaller than the idea predicted, null results for the other abilities tested, and generally low statistical power in the studies [4].
Taken together, these findings suggest that silencing notifications matters more than hiding the phone. Moving it out of reach still makes sense if you know you will be tempted to check it.
Sleep comes first
Sleep loss hits attention hard. A meta-analysis of 70 published articles on short-term total sleep deprivation (less than 48 hours without sleep) found the largest effect on lapses in simple attention tasks, and the smallest, non-significant effect on reasoning accuracy [5]. Those studies kept people awake with no sleep at all [5], which is more extreme than a short night, so they cannot tell you what one late evening costs. Still, if your focus is poor, sleep is the first thing to check. Sleep and memory explains more.
How to focus better, step by step
- Pick one concrete task and decide what "done" means for this session: "draft the introduction", not "work on the report".
- Silence notifications on your phone and computer for the length of the block.
- Close what you do not need: email, chat and unrelated tabs.
- Set a fixed block that you can manage, such as 25 or 50 minutes. Starting small is fine.
- When you notice your mind drifting, make a tally mark and go straight back to the task. Noticing and returning is the skill.
- Take a short break between blocks: stand up, move and rest your eyes.
- Review once a week: total focused minutes and distractions per hour, compared only with your own earlier weeks.
Breaks and the Pomodoro technique
The Pomodoro technique (work for 25 minutes, then take a 5-minute break) is popular, but we found only two short studies comparing it with other ways of taking breaks, and they disagree.
In one study, 87 university students did a day of real self-study with either self-chosen breaks or fixed breaks (6 minutes after every 24, or 3 after every 12) [6]. Students who chose their own breaks studied and rested for longer stretches, and this went with more fatigue and distraction and lower concentration and motivation than in the fixed-break groups; task completion did not differ [6].
In another, 94 university students took breaks during one two-hour study session in one of three ways: self-chosen, Pomodoro (5 minutes after every 25) or "Flowtime" (students chose when to stop, and the break length depended on how long they had studied) [7]. Pomodoro breaks made fatigue rise faster, and Pomodoro and Flowtime breaks made motivation drop faster, than self-chosen breaks; yet overall levels of fatigue and motivation did not differ between the groups, and neither did productivity, task completion or flow [7].
So planned breaks are a reasonable default, especially if you tend to skip breaks or let them sprawl, but no schedule has been shown to be best. Choose one you can keep up.
Mindfulness: small and inconsistent effects
Meditation is often recommended for focus, but two large meta-analyses reach different conclusions. One analysed 111 randomised trials and found small-to-moderate effects of mindfulness programmes on several measures, including executive attention, sustained attention and working-memory accuracy, but not on processing speed; effects were larger in people with elevated psychiatric symptoms than in healthy participants [8]. Another, pooling 45 randomised trials in adults, found a small overall effect, benefits only for executive function and working memory, and no advantage over active comparison programmes [9].
If you want to try it, counting your breaths is a simple form of focused-attention practice: you count each out-breath and start again when you notice you have lost count.
Try it on LaserMind
▶ Breath Counter & PacerCount your out-breaths, and press "I lost count" each time you notice you have drifted.
The LaserMind Deep Work Timer
The Deep Work Timer puts the steps above into one tool: one real task, one block and an honest count of how often you drift.
- Name your task and choose 25, 50 or 90 minutes. The task label is private: it is kept on your device, or in your account if you are signed in.
- Optional background sound: soft noise or white noise, offered only as a sound mask some people like, with no claims about its effects.
- Tap "I got distracted" each time you notice your attention has wandered. Counting does not stop the clock: you notice, then return. You can also pause, go full screen or end early.
- The clock runs on real time, so it keeps going while you work in another app or window, and the countdown shows in the browser tab.
- At the end you see your minutes of focused work and the distractions you noticed per hour. Sessions under a minute are not saved. A link takes you to the weekly check-in.
The distraction count is your own tally, not a test. Because it depends on what you notice, a higher count can simply mean you noticed more, so compare it only with your own history and look at the trend over several weeks.
Try it on LaserMind
▶ Deep Work TimerOne real task, one block, and a tally each time you drift.
Why can't I focus?
Most bad focus days have ordinary causes:
- Sleep: too little, or poor quality.
- Environment: notifications, noise, interruptions or a screen full of open tabs.
- Workload: too many tasks, unclear priorities, or a task that is vague or far too hard.
- How you feel: stress, worry, hunger or being unwell.
Changing these is usually the first step. But if difficulty concentrating lasts for weeks, affects your studies, work or relationships, or comes with other symptoms such as low mood, constant worry or severe daytime sleepiness, it can have a medical cause, for example an attention disorder such as ADHD, a sleep disorder, depression or anxiety, or the side effects of a medicine. These need a proper assessment by a doctor or other qualified professional. LaserMind's exercises and timers are practice tools: they are not a test for any condition and not a treatment.
Common mistakes
- Treating multitasking as efficiency. Each switch has a cost, even if it feels small.
- "Just checking" messages mid-block. It breaks the block, and the notification research suggests that even unanswered alerts carry a cost.
- Cutting sleep to fit in more focused hours. It works against you.
- Judging a technique after one day. Give a method a few weeks and look at your own numbers.
What the research says
What research has not established
Most of the evidence in this guide comes from short lab experiments or one-day studies, and the break studies included only university students. We know of no randomised trial testing whether practising single-tasking with a timer improves focus at work or school over months; on LaserMind, single-task deep work is graded as limited evidence.
In one review, the phone studies varied widely in method and generally had low statistical power. The two mindfulness meta-analyses reached different conclusions: one found larger effects in people with psychiatric symptoms than in healthy people, and the other found no advantage over active comparison programmes. The sleep meta-analysis covered total sleep loss of less than 48 hours, not the shorter nights most people have.
Your distraction tally is a personal record, not a validated measure of attention. Compare it only with your own earlier sessions.
Frequently asked questions
Does research back the Pomodoro technique? Only weakly. Two short studies with students found mixed results: fixed breaks helped mood and concentration compared with self-chosen breaks in one, while the other found no difference in productivity or task completion. Use it if fixed breaks suit you.
Can LaserMind tell me whether I have an attention problem? No. Our exercises and tools are practice, not diagnostic tests, and your results are compared only with your own history. If you are worried about your concentration, speak to a doctor or other qualified professional.
What the research says
Last evidence check 2026-10-11Switching between tasks costs time and accuracy, even when you can prepare for the switch. Trained task [1]
In a lab experiment, simply receiving phone notifications, without answering them, disrupted performance on an attention-demanding task, an effect the authors describe as comparable to that of actively using a phone. Trained task [2]
In one-day studies with university students, Pomodoro-style fixed breaks gave mixed results: one found less fatigue and distraction than self-chosen breaks with similar task completion, another found no difference in productivity, task completion or flow. Daily life [6][7]
The popular idea that a phone merely lying nearby drains your thinking is weakly supported: one meta-analysis found no overall effect, and another found only a small effect on working memory. Daily life [3][4]
A meta-analysis of 111 randomised trials found that mindfulness programmes had small-to-moderate effects on several attention and executive-function measures, but not on speed; effects were larger in people with psychiatric symptoms than in healthy people. Trained & similar tasks [8]
Another meta-analysis of randomised trials in adults found only small effects overall, benefits for executive function and working memory but not for attention, and no advantage over active comparison programmes. Trained & similar tasks [9]
References
- Monsell, S. (2003). Task switching. Trends in Cognitive Sciences, 7(3), 134–140. https://doi.org/10.1016/S1364-6613(03)00028-7
- Stothart, C., Mitchum, A., & Yehnert, C. (2015). The attentional cost of receiving a cell phone notification. Journal of Experimental Psychology: Human Perception and Performance, 41(4), 893–897. https://doi.org/10.1037/xhp0000100
- Hartanto, A., Lua, V. Y. Q., Kasturiratna, K. T. A. S., et al. (2024). The effect of mere presence of smartphone on cognitive functions: A four-level meta-analysis. Technology, Mind, and Behavior, 5(1), 1–14. https://doi.org/10.1037/tmb0000123
- Parry, D. A. (2024). Does the mere presence of a smartphone impact cognitive performance? A meta-analysis of the "brain drain effect". Media Psychology, 27(5), 737–762. https://doi.org/10.1080/15213269.2023.2286647
- Lim, J., & Dinges, D. F. (2010). A meta-analysis of the impact of short-term sleep deprivation on cognitive variables. Psychological Bulletin, 136(3), 375–389. https://doi.org/10.1037/a0018883
- Biwer, F., Wiradhany, W., oude Egbrink, M. G. A., & de Bruin, A. B. H. (2023). Understanding effort regulation: Comparing 'Pomodoro' breaks and self-regulated breaks. British Journal of Educational Psychology, 93(S2), 353–367. https://doi.org/10.1111/bjep.12593
- Smits, E. J. C., Wenzel, N., & de Bruin, A. (2025). Investigating the effectiveness of self-regulated, Pomodoro, and Flowtime break-taking techniques among students. Behavioral Sciences, 15(7), 861. https://doi.org/10.3390/bs15070861
- Zainal, N. H., & Newman, M. G. (2024). Mindfulness enhances cognitive functioning: A meta-analysis of 111 randomized controlled trials. Health Psychology Review, 18(2), 369–395. https://doi.org/10.1080/17437199.2023.2248222
- Whitfield, T., Barnhofer, T., Acabchuk, R., et al. (2022). The effect of mindfulness-based programs on cognitive function in adults: A systematic review and meta-analysis. Neuropsychology Review, 32(3), 677–702. https://doi.org/10.1007/s11065-021-09519-y