Your Body Has an Internal Clock
Sleep is influenced by the body’s circadian rhythm, an internal timing system that helps regulate periods of alertness and rest.
Light is one of the signals that helps regulate this system.
During the evening, exposure to bright light—particularly light from screens—can affect the timing of the body’s sleep signals. This is one reason sleep experts often recommend keeping evenings relatively dim and allowing yourself some time to wind down before bed.
The effect can vary considerably from person to person.
Why Your Phone Can Keep You Awake
The problem with nighttime phone use isn’t only the screen itself.
The content you’re consuming can also keep your mind engaged.
A stream of messages, social-media posts, videos, news updates, or work notifications can encourage you to remain mentally active when you’re trying to relax.
You might tell yourself you’ll check one more post.
Then another.
Before you know it, much more time has passed than expected.
Creating a period without screens before bedtime can help some people establish a more consistent nighttime routine.
Sleep Is More Than Just Time Spent in Bed
Getting enough hours of sleep is important, but sleep quality matters too.
During sleep, the brain and body carry out a variety of important processes associated with memory, learning, emotional regulation, and physical recovery.
Sleep also follows different stages throughout the night. Repeated awakenings or an inconsistent sleep schedule can interfere with how restorative sleep feels, even when someone spends plenty of time in bed.
That is one reason a person can wake up feeling tired despite believing they slept for a reasonable number of hours.
Other Factors Can Affect Sleep Quality
Screens and artificial light aren’t the only things that can interfere with rest.
Stress, an inconsistent sleep schedule, caffeine consumed too late in the day, uncomfortable room temperatures, noise, alcohol, certain medications, and underlying health conditions can all affect sleep.
For some people, persistent difficulty sleeping may be related to a sleep disorder rather than simply a poor bedtime routine.
That’s why it can be helpful to look at the bigger picture instead of blaming a single habit.
Simple Changes Can Make Bedtime Easier
If your evenings often involve screens until the moment you fall asleep, consider experimenting with a calmer routine.
You might:
- Dim the lights in the evening.
- Put your phone away for a period before bedtime.
- Keep a reasonably consistent sleep and wake schedule.
- Avoid caffeine late in the day if it affects your sleep.
- Keep the bedroom comfortable, quiet, and dark.
- Choose a relaxing activity such as reading or listening to calm music.
You don’t necessarily have to eliminate technology completely.
The goal is to create an environment that makes it easier for your body and mind to transition from daytime activity to rest.
When Ongoing Sleep Problems Deserve Attention
Occasional poor sleep is common.
However, persistent problems—such as regularly struggling to fall asleep, repeatedly waking during the night, waking unrefreshed, or experiencing significant daytime sleepiness—may be worth discussing with a healthcare professional.
Sleep problems can have many possible causes, and identifying the underlying reason is often more useful than simply trying another bedtime trick.
The Takeaway
Your nighttime routine can influence how easily you fall asleep and how rested you feel the next morning.
A bright screen or late-night notification isn’t automatically harmful, but frequent stimulation close to bedtime may make winding down more difficult for some people.
Sometimes, improving sleep starts with something surprisingly simple: giving your mind a little more quiet time before the day finally ends.