I think it’s worse this year, but there are a few other things going on that are exacerbating my symptoms.   I seem to have a weird form of it, which starts in late July or August, when my body begins to notice the reduction of light, even though summer is at its peak. Even though I detest winter, my mood starts to pick up in late January or February, when my body notices the lengthening days. I’m at my best in April – June and at my worst in November and December. My SAD seems to imitate the sleep/wake patterns of hibernating animals.

Graph I made showing my moods throughout the year. This never varies much.

Here’s an overview of what SAD is, from mayoclinic.org.

Seasonal Affective Disorder (SAD)

http://www.mayoclinic.org/diseases-conditions/seasonal-affective-disorder/basics/definition/con-20021047

Seasonal affective disorder (SAD) is a type of depression that’s related to changes in seasons — SAD begins and ends at about the same times every year. If you’re like most people with SAD, your symptoms start in the fall and continue into the winter months, sapping your energy and making you feel moody. Less often, SAD causes depression in the spring or early summer.

Treatment for SAD may include light therapy (phototherapy), psychotherapy and medications.

Don’t brush off that yearly feeling as simply a case of the “winter blues” or a seasonal funk that you have to tough out on your own. Take steps to keep your mood and motivation steady throughout the year.

Symptoms

By Mayo Clinic Staff

In most cases, seasonal affective disorder symptoms appear during late fall or early winter and go away during the sunnier days of spring and summer. However, some people with the opposite pattern have symptoms that begin in spring or summer. In either case, symptoms may start out mild and become more severe as the season progresses.

Major depression

Seasonal affective disorder is a subtype of major depression that comes and goes based on seasons. So symptoms of major depression may be part of SAD, such as:

Feeling depressed most of the day, nearly every day
Feeling hopeless or worthless
Having low energy
Losing interest in activities you once enjoyed
Having problems with sleeping
Experiencing changes in your appetite or weight
Feeling sluggish or agitated
Having difficulty concentrating
Having frequent thoughts of death or suicide

Fall and winter SAD

Symptoms specific to winter-onset SAD, sometimes called winter depression, may include:

Irritability
Tiredness or low energy
Problems getting along with other people
Hypersensitivity to rejection
Heavy, “leaden” feeling in the arms or legs
Oversleeping
Appetite changes, especially a craving for foods high in carbohydrates
Weight gain

Spring and summer SAD

Symptoms specific to summer-onset seasonal affective disorder, sometimes called summer depression, may include:

Depression
Trouble sleeping (insomnia)
Weight loss
Poor appetite
Agitation or anxiety

Seasonal changes in bipolar disorder

In some people with bipolar disorder, spring and summer can bring on symptoms of mania or a less intense form of mania (hypomania), and fall and winter can be a time of depression.

When to see a doctor

It’s normal to have some days when you feel down. But if you feel down for days at a time and you can’t get motivated to do activities you normally enjoy, see your doctor. This is especially important if your sleep patterns and appetite have changed or if you feel hopeless, think about suicide, or turn to alcohol for comfort or relaxation.

Causes

By Mayo Clinic Staff

The specific cause of seasonal affective disorder remains unknown. Some factors that may come into play include:

• Your biological clock (circadian rhythm). The reduced level of sunlight in fall and winter may cause winter-onset SAD. This decrease in sunlight may disrupt your body’s internal clock and lead to feelings of depression.
• Serotonin levels. A drop in serotonin, a brain chemical (neurotransmitter) that affects mood, might play a role in SAD. Reduced sunlight can cause a drop in serotonin that may trigger depression.
• Melatonin levels. The change in season can disrupt the balance of the body’s level of melatonin, which plays a role in sleep patterns and mood

Risk Factors

Factors that may increase your risk of seasonal affective disorder include:

• Being female. SAD is diagnosed more often in women than in men, but men may have more-severe symptoms.
• Age. Young people have a higher risk of winter SAD, and winter SAD is less likely to occur in older adults.
• Family history. People with SAD may be more likely to have blood relatives with SAD or another form of depression.
• Having clinical depression or bipolar disorder. Symptoms of depression may worsen seasonally if you have one of these conditions.
• Living far from the equator. SAD appears to be more common among people who live far north or south of the equator. This may be due to decreased sunlight during the winter and longer days during the summer months.

Complications

Take signs and symptoms of seasonal affective disorder seriously. As with other types of depression, SAD can get worse and lead to problems if it’s not treated. These can include:

• Suicidal thoughts or behavior
• Social withdrawal
• School or work problems
• Substance abuse

Treatment can help prevent complications, especially if SAD is diagnosed and treated before symptoms get bad.

Original article is here.