Why It's Harder to Get Up as the Mornings Go Dark

The alarm has not moved. You set it for the same time you set it for in July, and in July you were often awake before it went off, with the room already bright and the day obviously started. This week it goes off into the dark and you lie there for a while arguing with it. Nothing about you has changed. What has changed is outside the window. In London, sunrise on the first of September was 06:14. By the thirtieth it is 07:00, forty six minutes later, and the light your body was quietly using to start the day has moved out from under you.

The body clock does not read your phone. It runs on light, and it is at its most sensitive to light in the morning, when a strong bright signal tells it the day has begun and it is time to be awake. Through the summer that signal arrives before you do. From September onward it arrives after you, and it keeps arriving later until the clocks change. So you are not waking into a day that has already started. You are waking into one that has not, and asking your body to take your word for it.

The gap between indoor and outdoor light is far bigger than it looks, because your eyes adjust and a lit room feels perfectly bright. The numbers do not agree with the feeling. Researchers at the Light and Health Research Center at Mount Sinai put a dimly lit bedroom at around thirty to forty lux, and a brightly lit kitchen at about five hundred. Step outside on a grey, unpromising September morning and you are in five thousand to ten thousand. Even sitting beside a window and looking out is roughly a thousand. Overcast and outdoors beats indoors and well lit, by a wide margin, every time.

There is reasonable evidence that this matters over a life and not just over a morning. A study of more than four hundred thousand UK Biobank participants, led by A. C. Burns and colleagues and published in the Journal of Affective Disorders in 2021, found that each additional hour spent in outdoor daylight was associated with finding it easier to get up in the morning, feeling tired less often, and reporting fewer insomnia symptoms. It is observational, so it shows an association rather than proof of cause, and people who get more daylight differ in other ways too. Still, the direction is consistent and the sample is enormous.

The practical version is unglamorous. Get outside in the first hour you are awake, and give it fifteen to thirty minutes if you can. It does not have to be a walk with a purpose. Standing in the garden with a cup of tea counts. Taking the bins out slowly counts. Getting off the bus a stop early counts. The thing doing the work is light reaching your eyes, not the exercise, so you do not need to have changed into anything or committed to a routine.

If the dark genuinely makes that impossible, and for plenty of people in December it will, do the next best thing rather than nothing at all. Open the curtains before you do anything else, so the room starts changing while you are still in it. Eat breakfast at the window rather than at the table. A bright lamp is not the same as being outdoors, but a well lit room is a long way better than a dim one. And whatever you manage in the morning, keep the evening the other way round, dim and unhurried, so the two signals are not pulling against each other.

The other half of a dark morning is what you let into it. Most of us reach for the phone in the first thirty seconds, which is a lot of other people's urgency to take on before your feet are on the floor. A quieter start is easy to build. Layer rainfall over a forest, or birdsong and a stream, and let that be the sound of the room while you find your shoes. Make it the same mix every morning and it becomes a marker that the day has begun, which is roughly the job the light used to do on its own.

None of this makes a February morning feel like a June one. The mornings are going to keep getting darker until the middle of December, and pretending otherwise is not much use to anyone. But the difference between a dark morning you walk out into and a dark morning you scroll through in bed is a real one, and most people notice it inside a week. Open the curtains, get the light on your face, put something gentle on. The rest of the day tends to follow.