Winter Blues: Signs, Causes and What Actually Helps

The winter blues are a dip in mood and energy that arrives as the days get shorter: you sleep more, want carbs, find it harder to get going and feel flatter than in summer, but you still function and still enjoy things. Seasonal affective disorder (SAD), often called seasonal depression, is the clinical version, where the low mood is strong enough to disrupt daily life.

Here is how the two usually compare:

The quickest way to see where you sit is the winter blues check. It asks whether your mood and energy follow the seasons and shows how much daylight you are getting where you live right now, so you have something concrete to act on.

How common are the winter blues?

Very. In a telephone survey of randomly chosen households in Montgomery County, Maryland, 92 percent of people said they noticed seasonal changes in their mood and behavior, 27 percent said those changes were a problem for them, and between 4.3 and 10 percent, depending on the definition used, had a level of seasonal impairment similar to people with SAD. Winter was by far the most common time to feel worst.^[1] The researchers concluded that SAD sits at the far end of a spectrum that touches a large share of the population.

So if you feel heavier from November on, you are in the majority. The question is not whether you are affected, it is how much.

Signs of the winter blues

• You sleep longer and still feel tired, or getting up in the dark feels much harder.
• You crave bread, pasta and sweets more than in summer.
• Your motivation drops, and plans feel like effort.
• You see friends less and stay in more.
• Your mood is flatter, and things that usually lift you lift you less.
• Focus is harder in the afternoon, especially once it is dark by 5.
• You feel better on bright days or after time outside.

If these are mild and you still enjoy things, you are likely in winter blues territory. If they are strong, constant and getting in the way, read the section on when to see a doctor below.

Why do shorter days affect mood?

The honest answer is that the exact mechanism is not settled. The leading explanations involve light and the body clock. Light reaching your eyes in the morning is one of the main signals that sets your internal clock, and in winter that signal arrives later and weaker, while most people spend the brightest hours indoors. Changes in sleep timing, in hormones such as melatonin and in brain chemicals involved in mood are all being studied.

What is clear in practice is that it is daylight, not the calendar. The National Institute of Mental Health's page on SAD points out that the depression linked to SAD tracks changes in daylight hours, which is also why it is different from the holiday blues. If December stress is the bigger issue for you, see holiday stress.

Winter blues or seasonal depression: when to see a doctor

SAD is a type of depression with a recurring seasonal pattern. According to NIMH, symptoms usually start in late fall or early winter and go away in spring and summer, and the winter pattern often includes oversleeping, overeating with carbohydrate cravings and social withdrawal.

See a doctor or a licensed therapist if, for two weeks or more:

• You feel down, empty or hopeless most of the day.
• You have lost interest in things you usually enjoy.
• You are sleeping or eating much more or much less than usual.
• You are pulling away from people who matter to you.
• You are struggling to keep up with work, school or home.

SAD is very treatable. If you ever have thoughts of harming yourself, call or text 988 to reach the 988 Suicide & Crisis Lifeline.

For a deeper look at the clinical side, our guide to seasonal affective disorder signs and coping tools goes further, and the depression page explains how SAD fits within depression more broadly.

What helps the winter blues

On vitamin D: NIMH notes that studies testing vitamin D as a treatment for SAD have had mixed results. Rather than buying high-dose supplements on a hunch, ask your doctor whether a blood test makes sense.

Light therapy or talk therapy?

Both have good evidence for SAD. In a randomized trial of 177 adults with recurrent winter depression, six weeks of a version of cognitive behavioral therapy tailored to SAD worked about as well as daily morning light therapy at 10,000 lux. Remission rates were close to identical, at about 47 percent for each on the clinician-rated scale.^[2] CBT is skills-based, so what you learn can be used again next winter, while light therapy works day to day and is usually repeated each season. A doctor can help you decide.

The winter blues and the people around you

Seasonal dips rarely stay private. Sleeping more, having less patience and wanting to stay in can look like distance to a partner, and a partner who loves winter can seem baffling to one who dreads it. It helps to say it plainly: "Winter hits me hard. I am not pulling away from you, I am low on energy. What would help is one walk together on weekends." A weekly couples check-in gives you both a place to say how the season is landing before it turns into an argument.

Track it

Seasonal patterns only show up over months, which is why most people miss them. A little tracking now pays off next fall.

1. Take the winter blues check now and again in spring. Comparing the two tells you how strongly your mood follows the seasons.
2. Log your mood daily in the mood tracker. Its year in pixels shows the shape of your year at a glance: when the dip starts, how deep it goes and when it lifts.
3. Add sleep and energy. The 60-second check-in covers mood, energy, stress, sleep and connection, which are exactly the things winter moves.
4. Mark the start date. If your pixels darken in the second half of October every year, start your morning light and activity routine in early October next year, before the slide.
5. Watch for a deeper slide. If your check-ins show low mood most days for two weeks or more, take the CORE-10 check, a standard measure of psychological distress, and bring the result to a doctor.

Some winters the hardest part is not the dark, it is explaining to anyone why you feel this way when nothing is wrong. Say it out loud to Lovon, an AI coach you talk to by voice, and plan one small thing for this week that gets you outside and around people.