Blue Light & Sleep: What You Need to Know

A Guide to the Connection Between Blue Light and Your Sleep Quality

Screens dominate our modern life. Whether you work in a corporate office, are a cashier at a store, or are simply a mom with a TV in your house, screens are everywhere, and, quite frankly, are hard to escape. You might have heard the rants about blue lights and how they disrupt your sleep, but what exactly does that mean?

Here you will learn a simple breakdown of what blue light is and how it affects your sleep, as well as actionable steps you can take to improve your sleep schedule.

What Is Blue Light? 

Put simply, blue light is sourced from the sun, smartphones, TVs, computers, and LED lights, and helps regulate your internal body clock and alertness in the day, but has the opposite effect when used at night, as it causes your brain to think it’s daytime. 

It’s a high-energy, short wavelength part of the visible light spectrum that comes from the sun and digital devices. 

How Blue Light Impacts Your Sleep

Because blue light signals to your brain that it is daytime, when you use devices that have blue light at night, it can trick your brain into waking up, instead of getting ready to fall asleep, and can delay you from falling asleep. 

Three ways blue light negatively affects your body when trying to sleep are:

1. Melatonin Suppression: Blue light activates specialized cells in your retina (ipRGCs), sending a signal to your brain to reduce melatonin production, the hormone that makes you feel sleepy.
2. Disruption of Circadian Rhythm: Lower melatonin levels shift your body’s natural sleep-wake cycle, causing you to feel more alert when it’s time to wind down.
3. Heightened Alertness: By reducing melatonin and stimulating alertness-related hormones, blue light keeps you more awake and engaged, making it harder to fall asleep.

Signs Blue Light Might Be Affecting Your Sleep

If you only use devices occasionally before bed, or simply are wondering if you are being affected negatively by blue light, here are some signs that your sleep might be compromised due to blue light:

1. Trouble falling asleep
2. Staying alert even when you feel tired
3. Morning grogginess
4. Headaches or eye strain

If you are currently experiencing these symptoms, it might be a good idea to reduce your screen time use before bed to several hours before going to sleep. Small changes like leaving your phone outside your bedroom and limiting screen time well in advance before going to bed can help improve your sleep tremendously. 

How to Limit Blue Light Exposure at Night

1. Reduce screen time 1–2 hours before bed

2. Use blue light filters or night shift mode

3. Swap LED bulbs for warm lighting

4. Invest in blue light blocking glasses

5. Create a “screen-free” bedtime routine

• Reading
• Stretching
• Skincare
• Journaling

These simple swaps will have you sleeping better in no time!

Improving Your Sleep By Limiting Blue Light Exposure

Now that you understand the negative effects of using blue light before bed, you can improve your sleep quality and live a happier, healthier life by keeping your body’s circadian rhythm in check and getting the quality sleep you deserve.