Screens Before Bed: Light, Scrolling and What to Do Instead

Everyone has heard that screens before bed are bad for sleep, but the usual explanation, blue light, is only part of the story. What you do on the screen and how long it keeps you up matter too. This guide covers what the research says about light versus content, what the Sleep Health Foundation recommends, rules people actually keep, and what to use as an alarm once the phone is out of the bedroom.

The short answer: screen light can delay your body clock, but mostly with long, bright exposure. Interactive use (scrolling, messaging, gaming) keeps your brain alert, and screens quietly push bedtime later. The Sleep Health Foundation suggests switching screens off one to two hours before bed and keeping them out of the bedroom where possible. The simplest fix is to charge your phone in another room and use a separate alarm.

Light vs content: what the evidence says

A screen can affect your sleep in three separate ways, which are often lumped together.

Mechanism	How it works	How much it matters
Light	Bright screens can suppress melatonin, the hormone that signals night to your body	Real, but dose-dependent. The Sleep Health Foundation notes the evening melatonin rise is not affected by one hour of bright screen light, but it is after 1.5 hours (source)
Arousal	Interactive activities boost alertness and make you less ready for sleep	The Sleep Health Foundation says interactive use is more harmful for getting ready for sleep than passive use such as watching TV
Displacement	You stay up later than you meant to because the content keeps going	Easy to underestimate. The Sleep Health Foundation calls getting absorbed past your usual bedtime "bedtime procrastination"

The light effect builds up. Repeated bright-screen use over five days can delay the body clock by about 1.5 hours, so you consistently want to go to bed later and sleep in longer. That's the pattern behind social jet lag.

Flinders University researchers who reviewed the field describe the relationship as running both ways: screens can disrupt sleep, but people who can't sleep also reach for screens as a time filler or to manage their mood (source). If that's you, the screen is a symptom as much as a cause, and how to fall asleep faster will do more than a blue-light filter.

What the Sleep Health Foundation and healthdirect advise

• Switch off one to two hours before bed. The Sleep Health Foundation's sleep hygiene advice is to turn off all screens (computers, smartphones) one to two hours before bed and, if possible, not have them in the bedroom (source). healthdirect's insomnia advice uses one hour.
• Bed is for sleeping. healthdirect's wording: your mind needs to associate being in bed with sleeping rather than watching TV or using your phone (source).
• Dim it and use night mode. If you must use a screen, the Sleep Health Foundation suggests dimming it as much as possible and using night mode.
• Passive before interactive. For teenagers, the Foundation suggests interactive use earlier in the evening and passive use (TV, a film) closer to bedtime.
• Don't rely on a screen to fall asleep. The Foundation notes there's no evidence that TV in the hour before bed causes sleep problems, but if you need a screen to drop off, you'll struggle to settle without it at 3am.

Better Health Channel cites a VicHealth and Sleep Health Foundation study in which teens who put their phones down an hour before bed gained an extra 21 minutes of sleep a night (source). That's roughly an hour and 45 minutes across a school week.

Practical rules that people actually keep

"No screens after 8pm" fails for most people within a week. These rules tend to stick because they change the environment rather than relying on willpower.

1. Charge the phone outside the bedroom. This one rule does most of the work: no scrolling in bed, no checking the time at 3am, no notifications lighting the room.
2. Tie the cut-off to a habit, not a time. The phone goes on charge in the kitchen when you brush your teeth. See our 30-minute bedtime routine for adults.
3. Swap interactive for passive in the last hour. Watch something on the lounge TV with a fixed end time, and stop when it ends. Autoplay off.
4. Use the built-in tools. Night mode, low brightness, and a downtime setting that greys out apps after a set hour.
5. Give your hands something else. A paper book, a podcast on a speaker, a crossword. The gap is real and needs filling.
6. Don't take the phone to bed "just for the alarm". It's the loophole that undoes the rest.

If what keeps you up is the feeling that bedtime steals your only free time, see revenge bedtime procrastination.

Phone out of the bedroom: what to use as an alarm instead

The usual reason the phone stays on the bedside table is that it's the alarm. The options:

Alarm	Pros	Cons
Basic digital alarm clock	Cheap, reliable, no apps	Glowing display invites clock-watching; sound wakes a partner
Analogue clock	No light, no screen	Ticking bothers some people; loud bell
Vibrating wristband	Silent, no light, wakes only the wearer	Needs charging every couple of weeks
Phone in another room on loud	No new purchase	You have to get up to silence it; housemates hear it too

A full comparison is in alarm clocks without a phone. If you've been sleeping with your phone under the pillow so the vibration wakes you quietly, see phone under pillow vs a vibrating wristband.

Whatever you choose, cover any lit display. The Sleep Health Foundation recommends covering a bedroom clock to avoid clock-watching.

When to see your GP

If screens are out of the bedroom and you've kept a regular wind-down for a few weeks but still can't fall or stay asleep, see your GP. The same applies if you're very tired in the day, low or anxious, or snoring heavily. This guide is general information, not medical advice.

Where the Sovune Nudge fits

We make the Sovune Nudge, a silent alarm wristband, so we're not neutral. It exists for people who want the phone out of the bedroom but still need to wake on time.

• Set on the band itself. No app, no phone, no Bluetooth, no pairing, so there's nothing to check before bed.
• No light in the room. No speaker, no sound, and the small display only lights when you press the button, so there's no glowing clock to watch.
• Wakes you with vibration on your wrist, starting as a gentle tap and building through three intensity levels over a full minute.
• Three separate alarms, so weekdays and weekends can differ without touching a phone.

It comes with a 30-day money-back guarantee.

Quick answers

Is blue light really the problem with screens before bed? Only partly. Bright screen light can delay melatonin with longer exposure, but what you do on the screen and how late it keeps you up matter as much.

How long before bed should I stop using my phone? The Sleep Health Foundation suggests one to two hours; healthdirect suggests at least one hour.

Is watching TV before bed as bad as scrolling? Passive viewing is less alerting than interactive use, and the Sleep Health Foundation says there's no evidence that TV in the hour before bed causes sleep problems. Just avoid relying on it to fall asleep.

Does night mode fix it? It helps with the light. It does nothing about alertness or the extra hour of scrolling.

For every type of silent alarm compared, see our complete guide to vibrating alarms in Australia.

See the Sovune Nudge →