How to improve memory and focus when you work or study

Three years ago, I went to a neuropsychologist because I wanted to understand something that had followed me for a long time. I could not keep my concentration while studying, and what I studied did not seem to stick. That evaluation led to an ADHD diagnosis, and it changed how I understood my own brain.

I am not a doctor. I am someone who needed answers. This guide is what I wish someone had handed me: the habits that research supports for memory and focus, explained in plain language, with every source linked so you can check it yourself.

Whether you are studying for exams, learning a new skill for your job, or trying to get through a workday full of messages and meetings, the basics are the same.

Why is it so hard to focus when you work or study?

Focus is not a fixed tank of willpower. It is your brain choosing what to pay attention to and what to ignore, again and again, every minute. Modern work makes that choice harder. Notifications, open tabs, chats and a phone within reach all compete for the same attention.

Researchers have studied people who juggle many media streams at once. A 2009 Stanford study by Ophir, Nass and Wagner found that heavy media multitaskers were more easily distracted by irrelevant information and did worse on a task-switching test (PNAS, 2009). Later replication work found the link between media multitasking and distractibility was weak, and not significant after correcting for small-study effects (Wiradhany and Nieuwenstein, 2017).

So the honest finding is this: juggling screens will not ruin your brain, but every switch between tasks has a cost. Fewer switches usually means clearer thinking.

What does that look like in practice?

• Keep one task in front of you at a time, with only the tabs that task needs.
• Put your phone in a drawer or another room during a focus block.
• Close chat and email during study time, and check them at set times instead.
• Keep a paper notepad nearby. When a stray thought appears, write it down and return to it later.

What actually helps you remember what you study?

If you take one idea from this guide, take this one: rereading feels productive, but testing yourself works better.

In a classic experiment, Roediger and Karpicke had students either restudy a text or practice recalling it. Five minutes later, restudying looked slightly better. But on tests given two days and one week later, the students who had practiced recall remembered substantially more, even though the restudy group felt more confident about their memory (Psychological Science, 2006).

Timing matters too. A meta-analysis by Cepeda and colleagues pooled 839 assessments from 317 experiments and found that spacing study sessions apart improves retention. The longer you need to remember something, the longer the gaps between reviews should be (Psychological Bulletin, 2006).

In 2013, a team of cognitive and educational psychologists led by John Dunlosky reviewed ten popular study techniques. Only two received their highest utility rating (Psychological Science in the Public Interest, 2013):

I explain how to set this up step by step, with flashcards and a simple review calendar, in my guide to spaced repetition and retrieval practice.

How much does sleep matter for memory and focus?

More than most of us want to admit. The CDC recommends 7 or more hours of sleep for adults aged 18 to 60, and 8 to 10 hours for teens aged 13 to 17 (CDC). Yet in 2024, 30.5% of US adults slept less than 7 hours on average, according to a data brief from the CDC’s National Center for Health Statistics (NCHS, 2026).

Sleep helps memory on both sides of learning. Before learning, it prepares the brain to take in new information. In a study published in Nature Neuroscience, a single night without sleep significantly reduced activity in the hippocampus, a key memory region, while people were trying to learn, and they retained less afterward (Yoo and colleagues, 2007). After learning, sleep helps consolidate new memories, as reviewed by Diekelmann and Born (2010).

In practical terms, an all-nighter before an exam or a big presentation often works against you. I break this down in how sleep affects memory and focus.

Do short breaks really help you stay focused?

Yes, when they are planned. You have probably noticed that attention fades during long, repetitive tasks. Psychologists call this a vigilance decrement.

In a 2011 study in the journal Cognition, Ariga and Lleras gave people a long, monotonous task. Performance dropped steeply over time for those who worked straight through. Participants who were briefly and occasionally switched to a different task did not show that drop (Cognition, 2011). The researchers suggest the brain gets used to a goal held for too long, and a brief switch helps reactivate it.

You do not need a special app. A simple rhythm works: focus on one task for a block of time, then take a short break where you stand up, look away from the screen or get some water. Choose a block length you can actually repeat, and adjust it as you learn what works for you.

Can exercise improve memory?

Physical activity is one of the most studied habits for brain health. In a randomized controlled trial with 120 older adults, Erickson and colleagues found that aerobic exercise training increased the size of the anterior hippocampus by about 2% and improved spatial memory, while hippocampal volume declined in the comparison group (PNAS, 2011).

That study was done in older adults, so it does not prove the same effect for a 25-year-old student. Still, regular movement is good for your overall health, and a short walk is also an easy, screen-free break between focus blocks.

How do I build a simple focus routine for work or study?

Here is a routine that puts the research above into one sequence. Start with one or two steps, not all of them at once.

1. Decide the single task for your next block and write it down.
2. Remove your biggest distraction, which for most people is the phone.
3. Work on that one task for a focus block.
4. Take a short break away from the screen. Stand up, stretch or walk.
5. End each study session by testing yourself: close your notes and write what you remember.
6. Put a review of today’s material on your calendar for a few days from now.
7. Protect your sleep, especially before exams, deadlines and big days.

What if you have ADHD, or think you might?

This part is personal for me. Getting evaluated by a neuropsychologist is what finally gave me a clear explanation for my difficulties with concentration and learning.

The National Institute of Mental Health describes ADHD as “a neurodevelopmental disorder” marked by inattention, hyperactivity and impulsivity. NIMH notes that symptoms begin in childhood and usually continue into the teen years and adulthood, and that standard treatments include medication and psychosocial interventions such as therapy (NIMH).

The habits in this guide can support focus for anyone. But habits support professional care. They do not replace it. If you recognize yourself here, the best next step is an evaluation with a qualified professional, not a self-diagnosis from a blog, including this one.

When should you talk to a doctor about memory or focus?

A doctor can look at the full picture, including things a blog cannot see, such as your health history, medications and test results.

What about supplements for memory and focus?

You will see many products promising a sharper memory. I am researching this topic carefully, ingredient by ingredient, using sources such as the NIH Office of Dietary Supplements and PubMed. When that guide is published, it will cover what each ingredient has been studied for, who should not take it, possible side effects, and when to talk to your doctor.

One thing is already clear from the research above: no capsule replaces sleep, smart study methods and movement. Those come first.

About the author: Amanda Abreu

I was diagnosed with ADHD three years ago, after I went to a neuropsychologist to understand why I could not keep my concentration while studying or absorb what I was learning. Since then I have been reading the research on memory and focus and writing it up here in plain language, with every source linked.

I am not a doctor or a health professional. This guide is general education, not medical advice. Read my story or email me.

Medical note: this article is for general information and does not replace advice from your doctor. If you have concerns about your memory, attention or sleep, talk to a qualified health professional. See our medical disclaimer. This page contains no affiliate links.