The Last Hour Before Bed: Light, Screens and a Routine That Helps You Sleep

Light tells your body what time it is. How evening light and screens affect sleep, and a simple routine for the last hour of the day.

Your body keeps time with light. Bright light in the morning tells your internal clock that the day has started. Darkness in the evening tells it to get ready for sleep, and the brain starts releasing melatonin, the hormone that makes you sleepy.

Modern evenings send mixed signals. Overhead lights, a bright kitchen, a TV, then a phone held a foot from your face in bed. The clock gets told it is still daytime, and sleep comes later than it should.

What evening light does

Melatonin rises in the evening as light fades. Bright light at night can delay that rise and push your body clock later. Blue-rich light, the kind that comes from LED bulbs and screens, has the strongest effect, though brightness and duration matter too.

The screen is only part of the problem with phones. The content is built to keep you awake: messages, news, the next video. A dimmed phone in night mode is still a phone.

Dim the house after dinner

You do not need to sit in the dark. Switch from overhead lights to lamps. Choose warm bulbs, the ones labeled 2700K or lower, for the rooms you use at night. Dimmers are a cheap change that pays off every evening. Leave the bright light for the morning.

Set a screen cut-off

Aim to put screens away about an hour before bed. If that is unrealistic, start with thirty minutes and keep the phone out of the bedroom. A basic alarm clock costs a few dollars and removes the reason to bring the phone in.

If you watch TV in the evening, sit farther from the screen and turn the brightness down. Stop at the end of an episode, not in the middle of a cliffhanger.

Build a short routine

A routine works because it is the same each night. Your body learns the order and starts to slow down at the first step. Here is a sample for the last hour:

Keep it to things you enjoy. A routine you dread will not last.

Small details that help

Changing clothes counts. Getting out of day clothes and into something soft is a clear signal that the day is over. Pajamas you like wearing make the step easy to keep. A robe is handy for the half hour between the shower and bed.

Write things down. If your mind races at bedtime, a short list of what is worrying you and what you will do about it tomorrow can quiet it.

Keep it dark all night. Cover standby lights on chargers and TVs. If you get up at night, use a dim nightlight instead of the overhead light.

A note on melatonin pills

Melatonin supplements are easy to buy in the US and widely used. Doses on store shelves vary a lot, and supplements are not regulated like medicines. Melatonin can help with some timing problems, like jet lag, and is less useful for general insomnia. Ask your doctor or pharmacist before taking it, especially if you take other medicines or are pregnant.

Give it two weeks

Light habits take a little time to shift your clock. Keep the routine going most nights for two weeks, weekends included, and keep your wake-up time steady. If you still lie awake for long stretches most nights, talk to your doctor. Insomnia is common and treatable, and cognitive behavioral therapy for insomnia (CBT-I) is often the first treatment recommended.

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