Spend some time outdoors this winter: light, sleep and mood go together

Good news for your winter mornings: a few minutes outside can be a real help for your sleep and your mood. A new study found that when mood dipped in winter, it came with two things you can change. People moved less, and their light came in a narrow slice of the day.

Many of us feel lower when the days get short. We usually blame it on less light. This study suggests the way light is spread across your day matters too, and that is something you can shape tomorrow morning.

How the study worked

Researchers followed 422 young Australians, average age 24.3, who attended early-intervention clinics for emerging mood problems. Each person wore a wristband that tracked sleep, movement and light for at least 5 days, and that was paired with a clinical check-in. In all, there were 733 of these check-ins. It was a snapshot study, so it shows what goes together, not what causes what. It was published Oct. 29, 2026, in the Journal of Biological Rhythms.

What they found

Low mood, and low motivation and drive, were strongest in winter. Symptoms of mania, the high-energy swings seen in bipolar conditions, peaked in autumn instead.

The winter pattern had clear markers:

• People with more low mood in winter were less physically active overall.
• People with more low motivation in winter tended to sleep longer and start their day’s activity later.
• They also had a “constrained” light pattern. Their indoor light was moderate to bright and very regular, but it all came within a narrow window of the day.

The researchers also looked at how much time people spent in bright light. That alone was not linked to symptoms. What stood out was how the light was arranged across the day, not just how much of it people got.

This is the encouraging part. Movement and the timing of your light are things you can shape yourself, starting today.

What is a light pattern, anyway?

Think of it as your light schedule. Do you get light early, at midday and in the afternoon? Or do you get it all in one short stretch under indoor lamps? Your body clock reads that schedule to decide when to feel awake and when to feel sleepy. A wider spread of light gives it more to work with.

What you can do today

Tomorrow, step outside for 2 to 5 minutes within an hour of waking, even if it’s cloudy. Walk to the end of the block, drink your coffee on the porch or stand by the mailbox. Later in the day, take another short break near a window or outside. Then notice how you feel that afternoon.