Sleep · Protocol 1 of 15
Catch morning daylight soon after waking
1In 30 seconds
Step outside within 30 to 60 minutes of waking and let daylight reach your eyes for 5 to 10 minutes on a clear day. Stay out longer when it is cloudy. This tells your body clock that the day has begun, so you feel alert now and sleepy tonight.
2Picture it
3Why do it
- 1
You will feel more awake and focused in the morning because daylight switches off leftover melatonin and boosts your natural cortisol rise.
- 2
You will fall asleep more easily at night because your body clock knows exactly when your day started.
- 3
It is free, it takes minutes, and it fits around a cup of tea, a phone call or a short walk.
4How to do it
- Within 30 to 60 minutes of waking, go outdoors and face roughly towards the sun with no glass between you and the sky.
- On a clear morning, stay out for at least 5 to 10 minutes. On a cloudy morning aim for 15 minutes, and on a thick, grey day stay out for at least 30 minutes.
- Take off sunglasses and any brimmed hat for this time. Ordinary spectacles and contact lenses are fine to keep on.
- Never stare at the sun. Let yourself blink and squint as normal, and look a little to one side if it feels too bright.
- If you wake before sunrise, switch on plenty of bright indoor lights, then go outside once the sun is up.
- Make it easy by walking, drinking your tea or calling a friend while you are out there.
5Make it work in India
- In summer the sun is up by about 6 a.m. in most cities, so use your balcony, terrace or building compound before 8 a.m., when it is cooler and the sun is gentler.
- In monsoon, heavy cloud still lets useful daylight through. Stand at the open edge of a balcony or verandah, not behind a window, and stay out for 15 to 30 minutes.
- On smoggy winter mornings in north India the light is dimmer, so stay out longer. If the air quality index is very poor, stand at an open door or balcony instead of taking a long walk.
6The long read: the science2 min read · tap to open
Deep in your brain, just above the roof of your mouth, sits a tiny cluster of nerve cells called the suprachiasmatic nucleus, or SCN. Think of it as the conductor of an orchestra. It keeps trillions of cells across your body playing to the same 24-hour beat. Left alone, it runs slightly slow, so it needs a daily signal to stay on time.
That signal comes through your eyes. Your retina holds special cells that contain a light-sensing protein called melanopsin. These cells do not help you see shapes. Instead they measure brightness and colour contrast, and they love the mix of blue and yellow light found in early, low-angle sunshine. They report straight to the SCN.
When morning light hits these cells, three useful things happen. First, any melatonin still hanging about is switched off, so the sleepy fog lifts. Second, light helps clear the effect of adenosine, a chemical that makes you drowsy after short sleep. Third, your natural morning cortisol rise gets a boost of up to 50 percent. Cortisol has a bad name, but at this hour it is your wake-up hormone, and you want it high in the morning and low at night.
Windows filter out much of the useful light, which is why going outside matters. Clouds dim the light too, so stay out longer on grey days. Miss a morning and do not worry. Your clock reflects the last three or four days, not just today.
Good evidence Many human studies show that bright morning light sets the body clock and lifts alertness, but the exact minutes suggested here have not been tested head to head.
Questions people ask
Can I just sit by a sunny window instead?
It is better than nothing, but glass blocks much of the light your body clock responds to. If there is any way to step outside, even onto a balcony, do that instead.
What if it is dark when I wake up?
Turn on as many bright indoor lights as you can to start your day. Then go outside for your daylight dose once the sun has risen.
Is morning sun bad for my eyes?
Low morning sun carries far less UV than the midday sun, so it is gentler. Still, never force yourself to look straight at the sun, and let your eyes blink and look away naturally.
7Be careful
Never stare directly at the sun or force your eyes open. If you have macular degeneration or another eye condition, or your eyes are very light-sensitive, check with an eye doctor first. Avoid sunglasses only during this short window; wear them whenever you need them later in the day.
8Try it for 7 days
Tap a day each time you got morning daylight.
From the book: “View Sunlight as Soon as Possible After Waking” (Sleep Protocol 1). Evidence rating and India notes are our own.