For many people, seasonal affective disorder (SAD) conjures images of dark mornings, cold weather, and a dip in mood during the winter months. But seasonal depression does not always follow the calendar most people expect.

Some people experience depressive symptoms during late spring and summer instead. Sometimes called summer SAD, summer-pattern SAD, or reverse SAD, this less common form of the condition can leave people feeling anxious, restless, exhausted, and disconnected while everyone around them appears to be enjoying the sunshine.

The phenomenon is recognised as a seasonal pattern of depression, although researchers are still working to understand precisely why some people experience symptoms during warmer months.

What Is Summer Seasonal Affective Disorder?

SAD is a form of depression in which symptoms recur at a particular time of year and subsequently improve when the season changes.

Winter-pattern SAD is much more familiar, but some people experience the opposite pattern, with symptoms emerging during spring or summer. While winter SAD may involve sleeping excessively, increased appetite, and carbohydrate cravings, summer SAD is more often associated with insomnia, reduced appetite, agitation, and anxiety.

That difference can make the condition particularly confusing. Someone who feels restless rather than sleepy, for example, may not immediately recognise that their symptoms could be part of a seasonal depressive disorder.

Why Can Summer Trigger Depression?

There is no single explanation for summer-pattern SAD. Experts believe several biological and environmental factors may interact.

Heat and humidity are one possibility. High temperatures can interfere with sleep and leave people feeling physically drained. Cleveland Clinic psychologist Adam Borland, PsyD, describes summer depression as likely involving a combination of physiological and environmental factors, including the physical effects of heat and humidity.

Longer daylight hours may also play a role. Although sunlight is generally associated with positive effects on mood, extended daylight can disrupt sleep schedules and circadian rhythms in some people. Going to bed later, sleeping less, or maintaining an inconsistent routine can eventually affect energy and emotional well-being.

Then there are the routine changes that come with summer. Holidays, childcare arrangements, school breaks, and disrupted working schedules can all change a person's normal rhythm. For someone who relies on structure to manage their mental health, that disruption can be stressful rather than relaxing.

What Are the Symptoms of Summer SAD?

Summer SAD can involve many of the same core symptoms associated with depression, but certain features may be more prominent.

Possible symptoms include:

  • Persistent sadness or low mood
  • Loss of interest or enjoyment
  • Anxiety or agitation
  • Irritability
  • Restlessness
  • Difficulty sleeping or insomnia
  • Fatigue
  • Reduced appetite
  • Unintentional weight loss
  • Difficulty concentrating
  • Social withdrawal
  • Feelings of hopelessness or worthlessness

Not everyone experiences the same combination of symptoms. The timing is particularly important.

Having a bad week during a heatwave does not automatically indicate SAD. A clinician will look for a recurring pattern in which symptoms consistently emerge around the same season and improve at another time of year.

How Is Summer SAD Treated?

depressed woman with psychotherapist
Seek help if symptoms become severe or involve thoughts of self-harm or suicide. Drazen Zigic via Magnific

Treatment depends on the individual's symptoms and circumstances. Talking therapies, including cognitive behavioural therapy, can help people recognise and change patterns of thinking and behaviour associated with depression.

Antidepressants may also be considered where clinically appropriate. Treatment should be tailored to the individual rather than based solely on the season in which symptoms occur.

Lifestyle measures can also help. Maintaining a consistent sleep schedule, staying physically active, keeping regular meals, and creating predictable routines may be particularly useful when summer disrupts normal habits.

Managing heat exposure can matter, too. Keeping the bedroom cool and maintaining a comfortable sleeping environment may help people whose symptoms are worsened by heat-related sleep disruption.

When Should You Seek Help?

Feeling miserable during summer is not something you simply have to endure. If low mood, anxiety, irritability, sleep problems, or loss of interest persist, interfere with daily life, or return around the same time each year, speak to a GP or mental health professional.

It is especially important to seek help if symptoms become severe or include thoughts of self-harm or suicide. The most important point is that seasonal depression is not defined by cold weather or darkness. For a minority of people, the longer days, heat, disrupted routines, and social expectations of summer may coincide with a significant deterioration in mental health.

Frequently Asked Questions

  • What is Summer Seasonal Affective Disorder (SAD)?
    Summer Seasonal Affective Disorder is a form of depression where symptoms occur during the spring and summer months, as opposed to the more common winter-pattern SAD.
  • What are the symptoms of Summer SAD?
    Symptoms of Summer SAD can include low mood, anxiety, insomnia, irritability, fatigue, reduced appetite, and social withdrawal.
  • How is Summer SAD different from Winter SAD?
    While Winter SAD often involves increased sleep and appetite, Summer SAD is more associated with insomnia, reduced appetite, and agitation.
  • What factors can trigger Summer SAD?
    Factors such as heat and humidity, longer daylight hours, and changes in routine can contribute to Summer SAD.
  • How is Summer SAD treated?
    Treatment may include talking therapies, antidepressants, lifestyle changes, and managing heat exposure. Light therapy is not typically recommended for Summer SAD.
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