You know the moment. Lights off, head on the pillow, and somehow the phone’s back in your hand for “just five minutes.” Twenty minutes later you’re still scrolling, wide awake, and slightly annoyed with yourself. It’s such a common pattern that it barely registers as a decision anymore — but the two things people usually swap between at that point, a phone and a book, do genuinely different things to the body. According to sleep and circadian rhythm specialist Dr Katharina Lederle, looking at a phone or laptop screen at night is a bit like putting a mini-sun in front of your eyes.
That’s not a throwaway line. It’s describing something specific: the light itself is telling your body it’s still daytime, at the exact moment you’re trying to convince it otherwise.
This isn’t really a piece about willpower, or about phones being “bad.” It’s about what’s actually happening physiologically and neurologically in those last twenty minutes before sleep, and why the choice between a book and a screen ends up mattering more than it seems.
Reading a physical book before bed and scrolling a phone produce measurably different effects on sleep — not just in how relaxed you feel, but in how quickly you actually fall asleep and how deep that sleep turns out to be. The gap comes down to light exposure and the type of mental stimulation each activity provides, not personal preference.
Looking at a phone or laptop screen at night is equivalent to putting a “mini-sun” in front of the eyes — evening light exposure suppresses melatonin and prevents the body clock from registering that it’s nighttime.
Why This Actually Matters
The numbers here are more striking than “screens are bad for sleep” would suggest. A 2025 study tracking 847 adults found that reading before bed reduced the time it took to fall asleep by 50%, while phone scrolling increased that same time by 30%. That’s not a small gap — it’s the difference between falling asleep in under ten minutes and lying there for closer to twenty.
What’s easy to overlook is that this isn’t just about falling asleep faster. It compounds. Over four weeks, participants who read consistently before bed saw deep sleep duration increase and sleep efficiency climb from 79% to 87%. The group scrolling their phones went the other way — sleep efficiency dropped to 71%, meaning more time in bed for less actual rest. That’s the bit that tends to surprise people: it’s not that scrolling keeps you up a bit later. It’s that the sleep you do get afterwards is worse quality.
There’s also a wider context worth mentioning. Nearly half of UK adults — 46% — say they struggle to concentrate on reading at all, largely due to distraction, and reading regularly has declined noticeably since 2015. So this isn’t just about choosing a book over a phone at bedtime. For a fair number of people, sustained reading itself has become the harder skill.
What Actually Makes the Difference
Not all reading is equally calming, and not all of the difference between books and phones comes down to backlighting.
Start with the neuroscience of scrolling itself. Scrolling triggers “anticipatory arousal” — uncertainty about what’s coming next generates small dopamine releases that keep the prefrontal cortex engaged, rather than winding down. This is the mechanism behind the “just five more minutes” trap: each swipe is a tiny reward, and the brain keeps reaching for the next one. Reading a book doesn’t offer that same loop. There’s no infinite feed, no algorithm deciding what appears next — just a fixed sequence of pages that eventually runs out or naturally invites a stopping point.
Genre and content matter more than people expect. Fiction readers in the same study fell asleep fastest, averaging around nine minutes after putting the book down. Non-fiction readers took about fourteen minutes, and those reading work-related material or news took twenty-one. Chartered psychologist Dr Lalitaa Suglani frames the goal of pre-bed reading as low stimulation and emotional safety — which is another way of saying a gripping thriller you can’t put down might not be the ideal choice either, even though it’s fiction.
Even with brightness reduced and night mode enabled, phone use before bed still delayed sleep onset by around 22% in one study — suggesting the content itself, not just the light, is doing real work to keep the brain alert.
Duration has a sweet spot too. Reading for less than fifteen minutes doesn’t allow enough mental disengagement, while reading for over an hour risks becoming its own form of over-engagement — the twenty-to-forty-minute range tends to work best. And for anyone wondering whether an e-reader counts as “a book” for these purposes, the device itself matters more than you’d think.
A window of roughly 30 minutes before bed with no phone gives the body time to start winding down before you’re actually trying to sleep. Check final notifications beforehand, then leave the phone alone.
Charging it across the room rather than on the nightstand removes the easiest excuse to pick it up. It sounds obvious, but the physical distance does more of the work than willpower does.
This lets emergency contacts through while holding back everything else until morning — a compromise that removes the temptation without cutting you off entirely.
If you have to search for it, you’re more likely to default to the phone instead. Keeping it on the nightstand, spine facing you, makes it the easier option rather than the one requiring extra effort.
Five minutes of reading is a reasonable starting point if concentration has genuinely become hard. As sleep improves, reading tends to feel less effortful, which makes the next night easier than the first.
A clip-on reading light is worth mentioning here too, for anyone sharing a bed or a room — it solves the practical problem of needing light without switching on a main bulb or reaching for the phone’s torch function.
Where Devices Actually Sit on the Scale
Not every screen is equal, and the research here is more nuanced than “paper good, screen bad.”
E-ink devices, such as a Kindle Paperwhite, produce sleep results nearly identical to paper books, since they don’t emit the same backlight. Tablets used as e-readers are a different matter — users reported accidentally opening social media apps 23% of the time, which somewhat defeats the point. Audiobooks land somewhere in the middle: they helped participants fall asleep 35% faster than phone users, though not quite as fast as print readers, and a sleep timer matters here to avoid being woken when the narration stops.
| Format | Light exposure | Distraction risk | Sleep onset speed |
|---|---|---|---|
| Physical book | None | Low | Fastest — around 9 minutes for fiction |
| E-ink device | None (no backlight) | Low | Nearly identical to print |
| Audiobook | None | Low, needs sleep timer | 35% faster than phone scrolling |
| Tablet as e-reader | Backlit | High — apps often opened accidentally | Closer to phone-level delay |
| Phone scrolling | Backlit, high blue light | Very high | Delayed by 25–35% |
Note: Physical books lack the backlight that disrupts melatonin, whereas e-readers with blue-light filters sit somewhere between books and phones — better than a phone, but not quite as calming as paper.
A Couple of Things That Help
I went through a fair number of Amazon reviews while putting this together, mostly to see what people actually reach for once they’ve decided to make the swap rather than just meaning to. A few of the links here are affiliate ones — they don’t cost you anything extra, they just help keep the site going.
Light is the piece most people underestimate. Even a low bedside lamp can be brighter and cooler in tone than what’s actually needed for reading comfortably before sleep. The Casper Glow Night Light has a sleep mode that gives a constant, soft glow rather than a harsh overhead light — the kind of low-stimulation light that suits the “emotional safety” framing mentioned earlier, without the blue light spike of a phone screen. It’s not designed specifically as a reading light, but plenty of reviewers use it that way, and its automatic daylight shutoff means it’s not something you have to remember to switch off. It won’t replace a proper reading lamp for detailed close work, but for most paperback reading it’s more than adequate.
For anyone whose bedroom stays a bit too bright generally — streetlight through thin curtains, early summer mornings — the wider environment can undo some of the good work reading does. BellaHills Blackout Curtains block light effectively and add some noise reduction as a side benefit, which several reviewers mention buying room by room once they noticed the difference in one. It’s a bigger commitment than a night light, and it’s solving a different problem — not the reading habit itself, but the environment reading and sleep both depend on.
Who Each Approach Suits
The right starting point depends on what’s actually getting in the way of the swap, not just on preference.
If concentration is the real barrier — you pick up a book with good intentions and drift back to the phone within minutes — the fix is less about products and more about the steps above: physical distance from the phone, a visible book, and starting with a shorter session than you think you need. No amount of nice lighting solves a habit problem on its own.
If you’re not sure whether fiction or non-fiction suits you better before bed, try both over a fortnight and note roughly how long it takes to feel sleepy afterwards. The gap between fourteen and twenty-one minutes might sound small on paper, but it’s noticeable when you’re the one lying there.
If the issue is more about light quality — reading under a phone torch, or a main light that’s too bright and blue-toned for the hour — a dedicated soft light like the Casper Glow addresses that specific gap without requiring any change to your reading material or habits. And if the room itself never gets properly dark, no reading routine will fully compensate; that’s where the blackout curtains earn their place, particularly for anyone whose bedroom faces an early sunrise or a streetlamp.
- Reading before bed reduces the time it takes to fall asleep by roughly half, while phone scrolling increases it — this gap widens further over consistent weeks, not just on a single night.
- Fiction tends to work better than non-fiction, and non-fiction better than work-related or emotionally charged material — content matters nearly as much as the light source.
- E-ink readers perform almost identically to paper books, but tablets used for reading carry a real risk of drifting into apps — the device matters more than people assume.
A Small Swap Worth Trying
None of this requires an overhaul — just a book within reach, the phone somewhere else in the room, and a bit of patience if concentration feels rusty at first. If light is the piece that’s been missing, the night light is a small, low-effort place to start. If the room itself never quite gets dark enough, the blackout curtains deal with that separately. Neither is essential on its own — the habit is what actually does the work. If bedtime routines in general have felt harder to settle into lately, it’s worth reading a little about how the hours before sleep are shaped by the bedroom itself, since the room and the routine tend to reinforce each other.
Where This Came From
A short note on where the figures in this piece came from, for anyone who wants to read further.
RTÉ covers the physiological side of screen light and reading, along with the practical habit-stacking tips around keeping a book visible and setting a screen curfew.
The Independent reports on the State of the Nation in Adult Reading figures and includes expert comment from Dr Katharina Lederle and Dr Lalitaa Suglani on light exposure and low-stimulation reading.
Aihavit is the source for the 2025 sleep study figures, including onset latency, sleep efficiency over four weeks, and the device-by-device comparisons.
LBC covers Dr Rachael Molitor’s recommendations on screen curfews and moving the phone away from the bed as a practical behavioural change.
