How to Stop Blue Light from Your iPhone Disrupting Your Sleep

Have you ever felt like you couldn‘t fall asleep easily after using your iPhone at night? Or perhaps you‘ve struggled to get high quality, restorative sleep even if you fell asleep quickly? If so, the blue light emitted from device screens like your iPhone could be to blame.

In this comprehensive guide, I‘ll explain exactly what blue light is, why it has such a dramatic impact on sleep, and most importantly provide step-by-step solutions to effectively turn off blue light from your iPhone. Whether you want to use a built-in iPhone feature like Night Shift or third party blue light filter apps, I‘ve got you covered.

By the end, you‘ll have a strong understanding of this often overlooked health issue and actionable strategies to improve sleep health starting today using your own iPhone‘s settings and display tools. Let‘s get to it!

What Is Blue Light and Why Does It Matter for Sleep?

Before showing you how to turn it off in your iPhone, it‘s important to understand what exactly blue light is and why it‘s so relevant for sleep quality.

What is Blue Light?

Blue light is a high-energy, short-wavelength light that Boost visibility but also tells the brain to be alert and awake.

It‘s emitted from natural sunlight, but also in large amounts from digital device displays like your iPhone screen.

Blue light graphic

Blue light wavelength compared to other light wavelengths

Why It Disrupts Sleep

Here are three ways overexposure to blue light from iPhone screens makes high quality sleep virtually impossible:

  1. Suppresses melatonin – melatonin is the hormone that controls sleep/wake cycles. Blue light exposure suppresses natural melatonin production, signalling your body to stay awake.

  2. Confuses circadian rhythms – your body‘s internal clock relies on light/dark signals to know when to produce chemicals to make you sleepy and keep you alert. More blue light at night means this rhythm is shifted or confused entirely.

  3. Directly harms sleep quality – multiple studies like this sleep research show blue light exposure right before bed strongly correlates with less time spent in crucial REM and deep sleep.

The result? Difficulty falling asleep, staying asleep, feeling rested, and much more according to Yale researchers.

These sleep disruptions have been linked to long term health impacts like depression, diabetes, immune issues, heart disease, and many other problems.

Clearly, limiting blue light exposure from device screens (especially in evening hours) is critical for both short term sleep improvements AND long term health.

Now let‘s cover your all important options for preventing your iPhone screen from disrupting your sleep cycles…

How to Enable iPhone Night Shift (Native Blue Light Filter)

The simplest way to limit blue light from your iPhone is enabling Night Shift.

What Night Shift Does:

Night Shift is Apple‘s built in tool that warms/tints the colors on your entire iPhone screen to cut out blue light and automatically filter it with a sunset hue.

Think of it like automatic blue blocking computer glasses for your display.


  • Cuts blue light by shifting screen temperature
  • Easy one click access from Control Center
  • Can automate on schedule around bedtime
  • Free native iPhone feature

How to Turn On Night Shift:

  1. Open the Control Center menu by swiping down from top right of screen (iOS 16) or swiping up from bottom of screen on iPhone models with Home button.

  2. Locate and tap on the crescent moon shaped icon to open Night Shift settings.

  3. Move the Intensity slider fully towards More Warm. This sets the blue light filter effect to maximum.

Night Shift iPhone Settings

  1. Toggle the switch at top to ON to enable Night Shift on your iPhone.

That‘s all it takes to automatically and effectively cut exposure to sleep-disrupting blue light from your iPhone at night. Pretty easy right?

I recommend enabling Night Shift about 1-2 hours prior to your target bedtime for optimal effect and keeping intensity at max level.

Pro Tip: You can even set Night Shift to turn on/off automatically on a schedule that matches when you typically get ready for bed. Simply toggle on the "Scheduled" option in Night Shift settings and choose times. One less thing to worry about!

Now let‘s cover some additional ways to reduce blue light from your iPhone for even better sleep…

Supplemental Blue Light Reduction Strategies

While Night Shift is great, combining it with a few additional tweaks can help cut even MORE blue light for restorative sleep:

Lower Screen Brightness

Simply turning down brightness emits less blue light. Open your iPhone‘s Control Center and lower the slider to minimum comfortable level.

Try Blue Light Filter Apps

Specialized apps like F.lux give you more customization than Night Shift for optimizing blue light filtering to your personal needs and preferences. Worth experimenting with.

Enable True Tone Display

This adapts screen temperature to ambient lighting color and warmth automatically to reduce blue light emitted. Enable in Display settings.

Blue Light Reduction MethodProsCons
Night ShiftBuilt-in Free, Easy to UseLess Customization
Lower BrightnessSimple AdjustmentRequires Manual Changes
Blue Light Filter AppsHighly CustomizableMust Download Extra App
True Tone DisplayAutomatic AdjustmentsDoesn‘t Work in All Apps

Try combining a few of these blue light prevention measures for maximum benefit.

The Bottom Line

Hopefully this guide gave you a strong understanding of the sleep and health implications of overexposure to blue light from screens like your iPhone.

More importantly, you now have several effective strategies to cut blue light and take back control of your sleep schedule using native iPhone tools like Night Shift complemented by tweaks like reduced brightness.

Give the tips here a try for a few nights and see if you notice improvements in sleep quality, ability to fall asleep quickly, and overall daytime energy levels. Just blocking blue light from your tech at night can work wonders.

Let me know if you have any other questions!

Did you like those interesting facts?

Click on smiley face to rate it!

Average rating 0 / 5. Vote count: 0

No votes so far! Be the first to rate this post.

      Interesting Facts
      Login/Register access is temporary disabled