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Screens and attention

How phone use links with sleep, mood and focus, two plain terms for what pulls at your attention, and small ways to take some time back.

4 lessons · about 15 minutes to start · areas: Mind, Sleep, Learning

Phones are useful, and this isn't about giving them up (my example). It's about the times they take more than you meant to give (my example).

1. 1 When phone use feels out of hand

   Researchers call phone use that is hard to control and gets in the way "problematic smartphone use" (my example). In a pooled analysis of 14 studies, people with problem phone use were more likely to report poor sleep, depression and anxiety Yang and colleagues, 2019. Those studies show a link, not which one causes the other Yang and colleagues, 2019. In Korea's 2025 national survey, 22.7% of smartphone users were in the over-dependence group, including 43.0% of teens and 26.0% of young children Ministry of Science and ICT, 2026.

   Try it

   For three days, each time you pick up your phone without a reason, write one word for what you were feeling (my example).

   When-then

   When I reach for my phone without a reason, I'll name what I'm feeling before I open it (my example).

   How you'll know

   You can name your most common reasons for picking it up.

2. 2 Bandwidth sinks

   A "bandwidth sink" is our word for anything that takes attention and gives back less than you came for (my example). Endless feeds, alerts you never act on and hopping between apps are common ones (my example). Across 29 studies, problem phone use went with slightly lower grades, more so in younger students Paterna and colleagues, 2024.

   Try it

   For one week, turn off alerts for every app that isn't a person or a deadline (my example).

   When-then

   When an alert pulls me away and I don't act on it, I'll turn off that app's alerts (my example).

   How you'll know

   By the end of the week you notice fewer interruptions, by your own count.

3. 3 Too many inputs

   Some people feel saturated: so many inputs that nothing lands (my example). We call it "signal overload": a picture to think with, not a medical term or a diagnosis (my example). Does heavy multitasking on screens change how well people focus over time? (open question)

   Try it

   Pick one hour a day with a single input: one tab, one task or one conversation (my example).

   When-then

   When I start my first focused task of the day, I'll close everything else for one hour (my example).

   How you'll know

   You end that hour with the task further along than usual.

4. 4 Screens and sleep

   Healthy adults need at least 7 hours of sleep a night American Academy of Sleep Medicine and Sleep Research Society, 2015. The CDC suggests stopping electronic devices at least 30 minutes before bed CDC, 2024.

   Try it

   Charge your phone outside the bedroom for one week (my example).

   When-then

   When I brush my teeth at night, I'll put my phone on the charger outside the bedroom (my example).

   How you'll know

   Screens were away for the last 30 minutes before sleep on most nights CDC, 2024.