Seasonal Depression: Why It Happens and How Therapy Can Help
Updated: 4 days ago
It can happen quietly.
One week, you are getting through your days well enough. The next, it is 10 p.m., the house is dark, your phone feels too bright, and you are searching online for the answer to why this happens every winter and what you can do to help.
In Colorado, this shift can feel especially sharp. When daylight saving time ends, the clock changes overnight, but your body and mood may take longer to catch up. Local Colorado weather reporter Chris Bianchi shared that pre-5 p.m. sunsets will hit Denver the first of November. For many, that early darkness means evening begins before the workday has fully ended.
For some people, this is a mild seasonal slump. For others, it becomes something more serious and consistent, often called seasonal depression or seasonal affective disorder. The National Institute of Mental Health describes seasonal affective disorder as a type of depression that follows a seasonal pattern, most often starting in late fall or early winter and improving in spring or summer.
This post is informational and is not a substitute for medical or mental health care. If winter makes you feel unlike yourself, therapy can help you understand what is happening and build support around it.
Why the time change can hit harder than expected
The end of daylight saving time does not create depression by itself. But it can become the moment when people first notice the change.
Before the time change, there may still be a little light left after work or school. You might walk the dog, run an errand, sit outside for a minute, or feel like the day still belongs to you. After the clock shifts, that same hour can feel completely different. The sky is dark. The temperature drops. The body reads the environment as if the day is over.
That matters because light is one of the main signals your brain uses to regulate time.
Your body has an internal clock, often called the circadian rhythm. It helps guide sleep, energy, appetite, hormones, and mood. Morning light tells your brain, “The day has started.” Darkness tells your brain, “It is time to wind down.” When winter brings shorter days and earlier darkness, that system can get thrown off.
For some people, the result is subtle:
It gets harder to wake up
Motivation drops in the late afternoon
Social plans feel like too much
Sleep gets longer but less refreshing
Carbs and sugar sound more appealing
Small tasks start feeling oddly heavy
For others, it can become more intense. A person may feel sad most days, lose interest in things that usually matter, struggle to concentrate, or feel hopeless about getting through the season.
The hard part is that winter depression often does not announce itself clearly. It can sound like ordinary self-criticism:
“Nothing is really wrong, I'm just feeling blah”
“I should be able to handle this.”
“I just don't feel like doing anything.”
But if the pattern returns year after year, especially around the same season, it deserves attention.
What seasonal depression is and why it happens
The National Institute of Mental Health explains that seasonal affective disorder is not a separate disorder from depression. It is depression with a seasonal pattern. Most people who experience it have symptoms during the fall and winter months, though some people experience seasonal depression in spring or summer.
Researchers are still studying why SAD happens, but several factors appear to play a role.
Less light can affect brain chemistry
Shorter days can affect serotonin, a brain chemical involved in mood. Sunlight helps support normal serotonin activity, so reduced daylight can contribute to depression symptoms in some people.
It is important to clarify, this does not mean sunlight is a cure-all. It means light is one part of the larger system. When the light changes, the system may become less resourced, especially for people who already have a history of depression, anxiety, trauma, burnout, or high stress.
Darkness can shift melatonin and sleep
Melatonin is a hormone that helps regulate sleep. Your body usually makes more of it when it gets dark.
In winter, the longer stretch of darkness may change how melatonin is released. That can leave some people feeling sleepy earlier, groggy in the morning, or out of sync with their normal schedule.
This is why seasonal depression can feel different from ordinary sadness. It often shows up in the body. People may sleep more, move less, crave heavier foods, or feel physically slowed down.
Winter can shrink your life
When it gets dark before 5 p.m., life can get smaller without anyone choosing it. Fewer walks. Fewer spontaneous plans. Less time outside. More evenings spent indoors. More time alone with thoughts that get louder at night.
Colorado has many bright winter days, but that does not erase the impact of early darkness, cold evenings, and the emotional weight of another long season. Even in a sunny state, winter can narrow the range of things that help people feel like themselves.
The holidays can add pressure
The late fall and winter months also bring holidays, family expectations, financial stress, grief, and memories of past seasons. For some people, winter is tied to loss. For others, it brings pressure to be cheerful when they feel anything but.
That mismatch can make people feel isolated. Everyone else may seem festive, productive, or connected. Inside, it may feel like you are going through the motions, masking joy when it feels like you have a weighted blanket over your mind.
Signs winter may be affecting your mood
Not every low-energy winter day is seasonal depression. It is normal to feel some change as the weather shifts. Many people want more rest in colder months.
The difference is the level of distress, how long it lasts, and how much it interferes with life.
Common signs of winter-pattern depression can include:
Feeling sad, empty, numb, or tearful much of the time
Losing interest in things that usually feel enjoyable
Sleeping more than usual or struggling to wake up
Feeling tired even after a full night of sleep
Pulling away from friends, partners, or family
Eating more than usual, especially carbohydrates
Feeling guilty, worthless, or unusually self-critical
Having trouble focusing at work, school, or home
Moving or speaking more slowly than usual
Feeling hopeless about the months ahead
If every winter brings the same fog, the same shutdown, or the same sense that your personality has been muted, that pattern matters. You do not need to wait until things feel unbearable before getting support.
If you are thinking about suicide or feel like you might hurt yourself, call or text 988 in the U.S. to reach the Suicide and Crisis Lifeline. If there is immediate danger, call 911 or go to the nearest emergency room.
Why Colorado winters can feel emotionally confusing
Colorado can be a complicated place to feel depressed in winter.
Socially, Colorado says winter is for skiing, snowshoeing, bluebird days, and outdoor adventure. For many people, that is true and meaningful. For others, this is not the case.
If you live somewhere beautiful, it can feel harder to admit you are struggling.
If the sun comes out after a snowstorm, you may wonder why you still feel flat.
If friends are excited about winter activities that you do not enjoy, you may feel guilty or lonely.
You can live near the mountains and still experience depression. You can appreciate a sunny day and still feel heavy. You can love Colorado and still dread winter evenings.
The early sunset is often the daily trigger. It can arrive right as responsibilities pile up: finishing work, making dinner, helping kids, answering messages, caring for pets, or trying to force yourself to exercise. By 6 p.m., the night may already feel deep, and the rest of the evening may feel like something to survive rather than live.
That is exactly the kind of pattern therapy can help you name.
How therapy can help when winter changes your mood
Therapy does not make the sun set later. It does not erase winter. What it can do is help you stop blaming yourself for a pattern that has real biological, emotional, and behavioral parts.
A therapist can help you understand what winter does to your specific system. That may include your sleep, routines, relationships, thoughts, past experiences, and stress level.
Therapy helps you separate facts from self-criticism
Seasonal depression often comes with harsh inner commentary.
A therapist may help you notice the difference between:
“I am failing at life.”
“I never follow through.”
“I should just be grateful.”
“This will never change.”
“My depression symptoms are stronger this season.”
“My energy drops sharply after dark.”
“I can be grateful and still need support.”
“This pattern has returned, and I can respond earlier this year.”
Small shifts matter. Shame makes depression worse. Understanding creates room for change.
Therapy helps you build a winter plan
Many people wait until they are already deep in the winter fog before they ask for help. Therapy can help you be proactive instead.
A winter plan might include:
A consistent wake time
Morning light exposure when possible
Short outdoor time during lunch or early afternoon
Movement that feels realistic, not punishing
Regular meals and hydration
Negative thought identification and helpful replacements
Reduced isolation
Planned support on the hardest days of the week
A lower bar for chores and decisions during low-energy periods
A plan for holidays, grief, or family stress
The goal is not to become a perfect winter person. The goal is to make the season less lonely and less chaotic.
Therapy can treat depression directly
Several types of therapy can help with depression. Cognitive behavioral therapy, often called CBT, has strong research support for depression and has been adapted specifically for seasonal affective disorder. It focuses on the connection between thoughts, behaviors, and mood.
For seasonal depression, that might mean identifying patterns like withdrawing from people, spending long evenings scrolling, sleeping at irregular times, or assuming that low energy means the whole season is ruined.
Other forms of therapy may also help, especially when winter depression connects to trauma, grief, relationship stress, anxiety, or burnout. A therapist can help tailor care to you specifically, not just the symptom list.
Some people also benefit from light therapy, medication, or a combination of treatments. The National Institute of Mental Health lists light therapy, psychotherapy, antidepressant medication, and vitamin D as possible approaches for SAD. A primary care doctor, psychiatrist, or qualified mental health professional can help decide what is appropriate.
Therapy gives the 10 p.m. version of you somewhere to go
A lot of winter depression feels worst at night. That is when distractions fade, the house gets quiet, and the mind starts reviewing everything that feels wrong.
Therapy gives you a place to bring those thoughts before they become the only voice in the room.
Instead of trying to solve your whole life at 10 p.m., you can begin to recognize the pattern:
“This is the winter spiral.”
“This thought gets louder when I am tired and isolated.”
“I need connection, food, rest, or light, not another hour of self-judgment.”
That kind of awareness does not fix everything overnight. But it helps create a pause, and that pause can be the first signal to your brain that you are not as stuck as you feel.
The season may be real, but so is support
If you feel unlike yourself every winter, it is not a personal failure, it is a pattern worth understanding.
The early Colorado sunset can make the shift feel sudden. Daylight saving time ends, the evenings darken, and a familiar heaviness may return. Your brain and body respond to light, routine, sleep, stress, memory, and connection. When those pieces change, mood can change too.
Therapy can help you stop treating winter depression as something to hide away from or white-knuckle through. It can help you name what is happening, prepare for the harder months, and build a plan that fits your real life.
If it is 10 p.m. and you are searching for answers, let this be one of them: you are not alone in this experience and you do not have to just wait for spring to feel better.
Interested in Learning More?
If you would like to explore my therapy services further and understand how they can assist you, I encourage you to reach out. Visit RP Therapy Connect for more information and resources.
Written by Raelyn Pearson, LCSW, LSCSW
