Seasonal Affective Disorder (SAD) is a type of depression that follows a seasonal pattern, most commonly occurring in autumn and winter when daylight hours are shortest. Symptoms include low mood, fatigue, increased sleep, and carbohydrate cravings. Light therapy is a highly effective first-line treatment.
Common symptoms
See a doctor if symptoms significantly impair daily functioning, occur for two or more consecutive years, or if you experience thoughts of suicide or self-harm.
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WikiRemedy surfaces community experience, not medical advice. Always consult a qualified health professional.
Light Therapy (Bright Light Box)
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Bright light therapy using a 10,000 lux light box for 20–30 minutes each morning is the most effective evidence-based treatment for Seasonal Affective Disorder, acting directly on the circadian clock.
Dawn Simulation
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Dawn simulation uses a gradually brightening bedside light to mimic sunrise during dark winter mornings, signalling the circadian system to begin waking before alarm.
SSRIs for SAD
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SSRIs (particularly sertraline and fluoxetine) are used for moderate to severe SAD, particularly when light therapy is insufficient or inaccessible.
Vitamin D Supplementation
NaturalResearch
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Vitamin D deficiency is common in winter and has been associated with depression and mood disorders. Supplementation is widely recommended in low-sunlight months.
Outdoor Morning Walks
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Even on overcast winter days, outdoor morning light exposure provides significantly more light than indoor environments, supporting circadian entrainment and mood.
Cognitive Behavioural Therapy for SAD
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CBT adapted for SAD addresses negative thought patterns and behavioural withdrawal that develop in winter, and builds strategies for maintaining mood through the darker months.
Regular Exercise in Winter
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Maintaining regular aerobic exercise through autumn and winter counteracts the energy decline, hypersomnia, and withdrawal that characterise SAD.
Melatonin (Phase-Shifting Dose)
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Low-dose melatonin taken in the evening can help phase-shift the circadian rhythm that becomes delayed in winter SAD, complementing morning light therapy.
Social Activity Planning
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Deliberately scheduling social activities during winter months counters the social withdrawal that both characterises and worsens SAD episodes.
St. John's Wort for SAD
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St. John's Wort has been used for seasonal depression and has a compatible mechanism with the serotonin hypothesis of SAD.
WikiRemedy surfaces community experience, not medical advice. Always consult a qualified health professional.
Seasonal Affective Disorder
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Seasonal Affective Disorder (SAD) is a type of depression that follows a seasonal pattern, most commonly occurring in autumn and winter when daylight hours are shortest. Symptoms include low mood, fatigue, increased sleep, and carbohydrate cravings. Light therapy is a highly effective first-line treatment.
Common symptoms
See a doctor if symptoms significantly impair daily functioning, occur for two or more consecutive years, or if you experience thoughts of suicide or self-harm.
Filter by tradition:
WikiRemedy surfaces community experience, not medical advice. Always consult a qualified health professional.
Light Therapy (Bright Light Box)
LifestyleBright light therapy using a 10,000 lux light box for 20–30 minutes each morning is the most effective evidence-based treatment for Seasonal Affective Disorder, acting directly on the circadian clock.
Research
Strong
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Time to effect
1–2 weeks
Effort level
Low effort
How it works
Bright light suppresses melatonin, entrains circadian rhythms, and stimulates serotonin production in the retinohypothalamic tract — directly countering the light-deprivation trigger of winter SAD.
Caveat
Use a CE/TGA-certified 10,000 lux light box — not a UV tanning lamp. Timing is critical: use within 30 minutes of waking for best effect. Can cause mild headache or eye strain initially.
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