Understanding Seasonal Affective Disorder and Seasonal Low Mood
In short
Seasonal affective disorder (SAD) is a pattern of low mood that follows the time of year, most often beginning in autumn as daylight shortens and easing in spring. Seasonal low mood describes the same shape in a milder form.
What this is
Most people expect low mood to announce itself. Seasonal low mood rarely does. It usually arrives as a change in energy and appetite before it arrives as sadness — waking heavier, wanting more sleep than usual, reaching for carbohydrates, letting plans quietly fall away. By the time the flatness is obvious, several weeks of it have often already passed.
The clinical picture, described by services such as the NHS and the National Institute of Mental Health, is a depressive pattern that recurs at the same time of year — typically starting in autumn or winter and lifting in spring — rather than a separate illness. Recognising the pattern early matters, because the things that help most (light, rhythm, movement, contact with other people) are easiest to put in place before the withdrawal has set in.
What this can look like
- Noticing it first in your body — sleeping longer, waking unrefreshed, eating differently — rather than in your mood
- A steady loss of interest in things you were looking forward to in summer
- Cancelling more than you used to, without a clear reason for it
- Feeling slow, foggy or hard to motivate from late September or October onwards
- Bracing for it each year and dreading the clocks going back
- Being told to "just get out more" when the difficulty is precisely that going out feels impossible
Ways to reflect on this
- Write down what your own early signs were last year, while you can still remember them clearly — this is the single most useful thing you can do in autumn
- Track sleep, appetite and how much you cancel, rather than only mood — those usually shift first
- Get outside in daylight early in the day, even briefly, and keep it as a fixed routine rather than a decision
- Keep one regular contact with another person in the diary through the darker months, arranged before you stop wanting to
- Make plans for winter while it is still autumn — decisions made in low energy tend to shrink your life further
Related reading
Tools that can help
Available inside Echo Journey
- Brighten Your Seasons (guided journal) — Hendrina's guided journal for seasonal low mood — spotting your own pattern and building self-care that holds through winter
- Journal — A private place to note the early signs as they appear
- Weekly Insights
Frequently asked questions
What is seasonal affective disorder?
It is a pattern of depression that follows the time of year — most often beginning in autumn as daylight shortens and easing in spring. It is described as a seasonal pattern of depression rather than a separate condition.
What are the early signs of seasonal low mood?
Changes in sleep and appetite usually come first: sleeping longer, waking unrefreshed, craving carbohydrates, and gradually withdrawing from plans. Low mood and loss of interest often become obvious only after those.
When does SAD usually start?
Most people who experience a seasonal pattern notice it from early autumn onwards, often building through October and November, with improvement in spring.
Is seasonal low mood the same as depression?
It is the same family of experience with a seasonal timing. Some people have a mild seasonal dip; others meet the full picture of a depressive episode that recurs each year.
Does light therapy help?
Light exposure — daylight where possible, and light boxes for some people — is commonly used and is worth discussing with your GP, alongside routine, movement and contact with other people.
When should I speak to someone about it?
If low mood persists, worsens, or makes daily functioning difficult, speak to your GP or a mental health professional. If you have thoughts of harming yourself, contact your local emergency service now.
If autumn is where this starts for you
Brighten Your Seasons is Hendrina's guided journal for exactly this — written for the weeks before it takes hold, not after. You can start it inside Echo Journey.