Smartphone and Sleep: 6 Ways to Stop Scrolling Before Bed - A UK Guide

Understand Why Your Phone Fights Your Sleep Biology

Your phone is perfectly designed to keep you awake - literally. The bright, blue-rich light from your screen hits the melanopsin-containing cells in your retina and signals your suprachiasmatic nucleus (your brain's master clock) that it is still daytime. This suppresses melatonin production, the hormone that tells your body it is time to sleep.

The effect is measurable: a 2023 study from the University of Surrey found that 30 minutes of smartphone use at full brightness suppressed melatonin by 23% compared to reading a printed book.

But it is not just the light. The content - social media feeds, emails, news alerts - keeps your brain in a state of cognitive arousal. Your brain stays engaged because each swipe could reveal something interesting, important, or alarming. This combination of light-suppressed melatonin and mentally stimulating content is a double punch that makes falling asleep significantly harder.

The fix does not require throwing away your phone. Start by turning down the brightness and enabling the blue light filter (often called Night Shift or Night Mode) on your device. Most modern smartphones have these built in, and they make a real difference - though they are not a complete solution on their own.

Set a Digital Curfew - 60 Minutes Phone-Free Before Bed

This is the single most impactful change you can make. A 2024 study published in Sleep Medicine Reviews analysed 37 studies covering over 120,000 participants and found that people who used screens within 60 minutes of bedtime had significantly shorter total sleep time and lower sleep efficiency. The relationship was dose-dependent: more screen time meant worse sleep.

If 60 minutes sounds unrealistic, start with 30. Even that makes a measurable difference. Put your phone on Do Not Disturb mode and place it face down on a surface at least an arm's length away. Better yet, leave it in another room. The key is creating a physical and temporal boundary between phone use and sleep.

During this phone-free window, do something that actively signals wind-down to your brain. Read our full guide on building an effective wind-down routine for specific suggestions, but the short version is: dim the lights, read a physical book (a clip-on book light with warm LED is a great option for reading in bed), or take a warm bath. Anything that does not involve a screen.

Switch Your Phone to Grayscale in the Evening

This sounds too simple to work. It works. Social media apps are deliberately designed with bright, saturated colours to trigger dopamine release in your brain - every notification badge, every colourful image, every like button is engineered to keep you scrolling. Remove the colour, and you remove a significant part of that reward signal.

A 2022 study from the University of Michigan found that participants who switched their phone to grayscale reduced screen time by an average of 38 minutes per day. The effect was strongest in the evening hours, exactly when screen use is most damaging to sleep.

Setting it up takes 10 seconds. On iPhone: Settings > Accessibility > Display & Text Size > Colour Filters > Grayscale. On Android: Settings > Digital Wellbeing > Wind Down mode (which can automatically enable grayscale at a set time). Most manufacturers also have a quick-access shortcut - on Samsung, it is under Settings > Vision > Grayscale. Set it to activate automatically an hour before your target bedtime, and you will find yourself putting the phone down naturally.

Charge Your Phone Outside the Bedroom

If the phone is within reach, you will check it. It is not a character flaw - it is a trained behavioural response. The ping of a notification activates the same dopamine pathway as a slot machine's flashing lights. Even on silent, the mere presence of your phone within arm's reach reduces the quality of your sleep.

A 2021 study in Computers in Human Behavior found that people who kept their phone in their bedroom at night reported significantly higher rates of insomnia and more fragmented sleep, even if they did not consciously check it during the night.

The fix is brutally simple: buy a standalone alarm clock and charge your phone in the kitchen or living room. A sunrise alarm clock like the Lumie Bodyclock provides a gentler wake-up than a smartphone alarm anyway, without the temptation to check emails and notifications first thing in the morning - which sets off a cascade of cortisol that primes your brain for stress before your feet have touched the floor.

I know the counter-argument: I use my phone as my alarm. Buy a £15 alarm clock. It is the best money you will spend on your sleep this year.

Replace Scrolling with a Low-Stimulation Alternative

Willpower is a limited resource. Replace the habit, do not fight it. Trying to stop scrolling by sheer force of will usually fails because the behaviour is neurologically reinforced. The better approach is to replace scrolling with something that provides a similar sense of winding down without the stimulating side effects.

What works well: reading a physical book or a Kindle (with no backlight, or with the warm light setting on minimum), gentle stretching or yoga, writing in a journal (the act of putting thoughts on paper reduces cognitive arousal), listening to an audiobook or podcast (audio content does not suppress melatonin), or simply sitting in dim light with a cup of herbal tea.

The NHS recommends establishing a consistent wind-down routine as one of the core pillars of good sleep hygiene - and the research backs this up. A 2023 randomised controlled trial found that participants who followed a consistent 30-minute pre-bed routine (no screens) fell asleep 15 minutes faster than those who did not.

If you absolutely must use your phone in the evening, wear a pair of blue light blocking glasses - the evidence suggests they reduce sleep onset latency by around 12 minutes. But remember, the glasses are a compromise, not a solution. The real fix is putting the phone down.

Optimise Your Phone Settings for Sleep

Your phone already has tools to help you sleep. Use them. Modern smartphones come with built-in sleep features that can automate much of what I have described above, removing the need for willpower entirely. Here is how to set them up:

On iPhone: Go to Settings > Focus > Sleep. This creates a custom home screen that hides distracting apps, silences notifications, and can automatically enable Do Not Disturb at your chosen bedtime. Pair it with Screen Time > Downtime which locks you out of selected apps during the evening hours. Enable Night Shift (Settings > Display & Brightness > Night Shift) to shift the screen colour temperature warmer automatically at sunset.

On Android: Go to Settings > Digital Wellbeing > Bedtime mode. This enables grayscale, Do Not Disturb, and dims the screen automatically at your scheduled bedtime. Samsung phones have a similar feature under Modes and Routines. Google Pixel phones have the most polished implementation - the entire phone interface fades to grayscale and notifications are silenced with a single toggle.

If you share a bedroom with a partner, consider getting a white noise machine to mask the silent-but-present hum of a phone charging on the nightstand - the consistency of sound can also help you fall asleep faster. But the most important step is still the simplest: put the phone away.