Many people spend the last few minutes before bed looking at a phone, tablet, computer, or television. It may feel relaxing to scroll through social media, watch videos, or play a game, but staring at a screen can make it much harder to fall asleep.
One major reason is light. Screens give off bright light, including blue wavelengths that can affect your body’s internal clock. Normally, as the evening gets darker, your brain begins preparing for sleep and releases a hormone called melatonin. Melatonin helps you feel tired and signals that it is time to rest. Bright screen light late at night can interfere with this process, making your brain behave as if it is still daytime.
The problem is not only the light. What you are doing on the screen can also keep your brain awake. Social media, games, videos, messages, and news can be mentally stimulating. Instead of becoming calm before bed, your mind may stay busy thinking about what you just watched, read, or responded to. Exciting, stressful, or emotional content can make this effect even stronger.
Screens can also cause people to stay awake longer than they intended. You may tell yourself that you will watch one more video or scroll for five more minutes, only to realize that half an hour has passed. This delays bedtime and reduces the total amount of sleep you get.
Another issue is that using screens in bed can teach your brain to associate your bed with being awake. Ideally, your bed should become a signal that it is time to sleep. If you regularly spend long periods scrolling or watching videos there, your brain may have a harder time switching into sleep mode.
To make falling asleep easier, try reducing screen use before bed. Dimming your screen, using a nighttime display setting, and keeping your device farther away can help, but taking a break from screens altogether is usually better. Instead, you could read a printed book, listen to quiet music, prepare your things for the next day, or simply relax in a darker room.
Sleep depends on your brain receiving the right signals at the right time. When you stare at a bright, interesting screen late at night, you are giving your brain reasons to stay alert. Creating a calmer, darker routine before bed can make it easier for your body to recognize that the day is over and it is time to sleep.
