As the Days Get Shorter: What 2026 Research Says About Treating Seasonal Affective Disorder

As September comes to a close, the days are beginning to shorten. For many people, that shift brings cozy routines and beautiful changes in nature. For others, it can signal the return of low mood, fatigue, withdrawal, oversleeping, or a sense of emotional heaviness.

If your mood reliably changes with the seasons, you are not imagining it, and you do not have to wait until winter symptoms become overwhelming before asking for support.

Seasonal affective disorder (SAD) is a form of depression with a recurring seasonal pattern. According to the National Institute of Mental Health, winter-pattern SAD commonly involves persistent sadness, reduced interest, low energy, difficulty concentrating, oversleeping, carbohydrate cravings, and social withdrawal.

This fall, I want to share what newer research says about treatment, and how you can begin building a supportive plan now.

The 2026 takeaway: Light therapy works, but timing matters

A systematic review and meta-analysis by Wu and colleagues, published in the April 2026 issue of the Journal of Affective Disorders Reports, examined 17 randomized controlled and crossover trials of light therapy for SAD.

The findings offer encouraging, practical information:

• Light therapy significantly reduced SAD symptoms around week two of treatment.

• The clearest effect appeared at week two, with a meaningful reduction in depressive symptoms.

• The researchers recommend at least two weeks of daily light therapy to reach desirable outcomes.

• Benefits were not clearly maintained at the one-week post-treatment follow-up after light therapy stopped.

In other words, light therapy is not a trendy wellness gadget without evidence behind it. It is a legitimate, research-supported treatment for winter-pattern SAD. At the same time, the benefit may depend on consistent use. Stopping after a few days, or using it only when you feel especially low, may not give you a fair opportunity to see whether it helps.

The full Wu et al. review is especially useful because it looks not only at whether light therapy works, but also at when improvement appears and what may happen after treatment ends.

What does light therapy usually involve?

Light therapy generally uses a specialized light box designed to provide bright light while filtering out potentially harmful ultraviolet light. The NIMH describes a common approach as sitting near a 10,000-lux light box for approximately 30–45 minutes in the morning, usually from fall through spring.

However, the right approach can vary. I encourage you to:

• Choose a device designed specifically for light therapy.

• Follow the manufacturer’s instructions regarding distance and duration.

• Use it in the morning rather than late at night.

• Give the routine at least two weeks unless a qualified provider recommends otherwise.

• Ask a medical or mental health professional for guidance if you have an eye condition, take medication that increases light sensitivity, or have bipolar disorder.

Light therapy may cause mild side effects such as headaches, eye strain, nausea, or feeling unusually activated. If you notice agitation, reduced need for sleep, racing thoughts, or an elevated mood, stop and contact a qualified provider promptly.

The longer-term question: Can therapy help prevent the next winter?

Light therapy may help address the biological effects of reduced daylight. Therapy can help you understand and change the thoughts, behaviors, and routines that may keep seasonal depression going.

A systematic review and meta-analysis by Melton and colleagues, published in The Cognitive Behaviour Therapist in 2025, compared group CBT tailored for SAD with light therapy. At the end of treatment, the two approaches were similarly effective in reducing depressive symptoms.

The difference became clearer later.

At one- to two-year follow-up, group CBT was associated with fewer depressive symptoms than light therapy. The review also found evidence suggesting lower recurrence over time. The authors were appropriately cautious: the long-term analysis included only three randomized controlled trials, and the studies had limitations. The research focused on a specific group CBT protocol, so it should not be interpreted as proof that every form of therapy will produce identical results.

Still, the pattern is meaningful. Light therapy may support you while you are using it. CBT can help you develop skills that remain available after therapy ends.

The Melton et al. review suggests that CBT may have a more lasting effect because it addresses seasonal thoughts and behaviors directly, including:

• “Winter always ruins my life.”

• “There is no point making plans when it gets dark so early.”

• “I should stay home until I feel better.”

• “I will never get through another season.”

Therapy does not require you to force positive thinking or pretend that winter is easy. Instead, I can help you notice patterns, test whether they are accurate or useful, and build alternatives that respect your real experience.

Build your fall plan before the dark months

If you have experienced seasonal depression before, late September is a good time to prepare. A plan made before symptoms intensify is often easier to follow than one created when you are already exhausted and discouraged.

1. Anchor your mornings with light

Open the curtains as soon as you wake up. Sit near a bright window. Take a short walk outside if your schedule and safety allow. If you are considering a light box, discuss how to use it appropriately with a qualified provider.

Morning light can become an anchor for your sleep-wake rhythm and your daily routine.

2. Protect your sleep schedule

SAD can involve oversleeping, but more time in bed does not always lead to more restorative sleep. Try to keep a consistent wake time, including on weekends. Dim the lights in the evening, reduce stimulating activities before bed, and create a wind-down routine that feels realistic rather than rigid.

If your sleep changes significantly, bring it up with a healthcare professional.

3. Keep moving, even in small ways

Low mood often tells us to wait until we have more energy before moving, socializing, or doing something meaningful. Unfortunately, waiting can deepen withdrawal.

Start small:

• Take a ten-minute walk.

• Stretch between work meetings.

• Schedule movement with a friend.

• Try a gentle class, yoga, or strength training.

• Walk outside during the brightest part of your day.

Movement does not have to be intense to be valuable. The goal is to support your body and interrupt the cycle of isolation and inactivity.

4. Name seasonal thoughts without judging yourself

Notice what your mind says as the season changes. You might write down:

• The thought

• The feeling it creates

• The behavior it encourages

• A more balanced response

For example:

Thought: “I will lose all my motivation this winter.” Balanced response: “Winter has been difficult before, and I can prepare early and ask for support if symptoms return.”

This is not about dismissing your concerns. It is about making space between a thought and an automatic reaction.

5. Keep connection on the calendar

When depression begins, social withdrawal can feel protective. But regular, low-pressure connection can help protect your mood. Plan a weekly phone call, shared meal, walk, faith community activity, hobby, or check-in with someone you trust.

Choose forms of connection that feel emotionally safe and sustainable. You do not have to attend every event or explain everything before you are ready.

When should you reach out for professional support?

Consider reaching out if:

• Your symptoms return around the same time each year.

• Low mood, fatigue, or withdrawal lasts two weeks or longer.

• You are missing work, school, caregiving, or important responsibilities.

• Sleep or appetite changes feel difficult to manage.

• Self-care efforts are not enough.

• You feel hopeless, numb, or increasingly isolated.

• You are having thoughts of death or suicide.

At Talk to Heal Counseling Center, I provide a safe, supportive, and respectful space to explore what changes with the seasons and what may help you feel more grounded. Together, we can look at your history, strengths, routines, and treatment preferences. Therapy may include evidence-based strategies such as cognitive behavioral techniques, behavioral activation, trauma-informed care, and practical relapse-prevention planning.

Treatment should fit you, not the other way around

The 2026 research does not suggest that you must choose between light therapy and psychotherapy. For some people, a combination may be appropriate. For others, therapy may be preferable because it offers a way to understand recurring patterns and build skills for future seasons.

I also understand that starting therapy can feel like a major step. That is why Talk to Heal offers a free 15-minute consultation so you can ask questions and get a sense of whether we may be a good fit. We accept many insurance plans, including UHC, Aetna, Cigna, and others. Online booking and telehealth options can make care more accessible, and psychotherapy is available in multiple languages.

Care is provided only in the State of Georgia. To learn more or schedule a consultation, call 404-369-3838.

If you are in immediate danger or having thoughts of suicide, call or text 988 for the Suicide & Crisis Lifeline, or call 911 in a life-threatening emergency.

You do not have to wait for the darkest months to begin caring for yourself. Start with one morning light routine, one walk, one honest conversation, or one appointment. Small steps taken early can become meaningful support when winter arrives.