By mid-November in Missoula, the sun is already behind the mountains by late afternoon. By December, many of us are driving to work in the dark and driving home in the dark, with fewer than nine hours of daylight in between. Add inversions that hold gray air in the valley for days, plus a calendar full of parties, travel, gift lists and family expectations, and it's no surprise that a lot of people start to feel off this time of year.
For some, that's a passing dip. For others, it's something heavier that shows up every year, right on schedule. That pattern has a name: seasonal affective disorder, or SAD.
What Is Seasonal Affective Disorder?
SAD isn't a separate condition from depression. It's a type of depression that follows a seasonal pattern, most often starting in late fall and lifting in spring. Symptoms typically last about four to five months a year. To be diagnosed, the depressive episodes need to come back in the same season for at least two years in a row.
Researchers don't know exactly what causes it, but light seems to play a central role. Less daylight can shift the body's internal clock, change how much melatonin the body makes, and affect serotonin, a brain chemical tied to mood. People who live farther north, where winter nights are long, are at higher risk. SAD is also more common in women and in people who already live with depression or bipolar disorder.
Winter Blues vs. Seasonal Depression
Feeling a little sluggish when it's 15 degrees and dark at 4:45 p.m. is normal. Seasonal depression is different in how deep it goes and how long it lasts. It can look like:
Feeling down, flat or hopeless most of the day, nearly every day
Losing interest in things you usually enjoy
Sleeping much more than usual, and still waking up tired
Craving carbohydrates and noticing changes in appetite or weight
Low energy, or moving and thinking more slowly
Pulling away from friends and plans, a kind of "hibernating"
Trouble concentrating, irritability, or feeling guilty and worthless
If several of these have stuck around for two weeks or more, or they're getting in the way of work, relationships or daily life, it's worth talking with a provider. And if this same slump arrives every year, that pattern is useful information in itself.
Why the Holidays Can Make It Harder
The holidays land right in the middle of the darkest weeks of the year, and they bring their own pressure. Even for people without SAD, this season can stir up depression and anxiety:
The pressure to feel happy. Every ad, song and social feed says this is the most wonderful time of the year. When you don't feel that way, it can feel like you're failing at something.
Grief and empty chairs. Loss is often felt most sharply at gatherings and traditions built around the people who are gone.
Family dynamics. Time with family can be warm, complicated, or both, sometimes in the same afternoon.
Money stress. Gifts, travel and hosting add up quickly.
Broken routines. Late nights, travel, more alcohol and less movement can throw off sleep and mood, right when your body needs steadiness most.
Loneliness. If you're far from family, recently out of a relationship or just short on connection, the season can make that gap feel louder.
None of this means something is wrong with you. It means you're a person in a hard season.
The Part That Goes Missing: Enjoyment
One of the hardest parts of seasonal depression is what it takes away. Holiday lights look like clutter. A favorite meal tastes like nothing. A ski day or a walk in fresh snow, the things that usually make winter in Montana worth it, start to feel like too much effort.
That loss of pleasure has a clinical name: anhedonia. At Inner Journey, we take it seriously. We believe the ability to enjoy your life is part of being healthy, not a bonus you earn after the "real" symptoms are gone. So when we think about seasonal depression, the goal isn't only getting through to March. It's getting some of the good parts of winter back.
What Helps
The good news is that SAD and seasonal depression are very treatable, and treatment often works faster when it starts early in the season.
Light therapy. Since the 1980s, light therapy has been a standard treatment for SAD. It uses a light box that's much brighter than normal indoor lighting and filters out UV light, usually for about 30 minutes each morning. If it's going to help, people usually notice a difference within three to four weeks. It isn't right for everyone, including people with certain eye conditions or those taking medications that increase light sensitivity, and it can rarely trigger mania in people with bipolar disorder. So it's worth checking with a provider before you buy one.
Therapy. Talk therapy, especially cognitive behavioral therapy (CBT), has been studied for SAD and has been found to work about as well as light therapy. Part of what makes it useful is very practical: it helps you notice the thoughts that winter brings up and plan small, enjoyable activities on purpose, even when you don't feel like it. Therapy is also a good place to work through grief, family stress and the expectations the holidays carry.
Better sleep. Sleep and depression are closely linked. If you're sleeping too much, too little, or at odd hours, CBT for insomnia (CBT-I) is a structured, research-backed way to get your sleep back on track.
Medication. Antidepressants can help with seasonal depression, either on their own or alongside light therapy and therapy. Some people start medication before their usual symptoms begin, so the dark months hit less hard.
A medical check. Thyroid problems, low vitamin D, hormonal changes and other medical issues can look a lot like depression, and some are more common in winter. Ruling them out is a smart step, especially if this is new for you.
When depression doesn't let up. For some people, winter isn't the cause of their depression. It just makes an ongoing depression heavier. If you've tried two or more antidepressants without enough relief, options like Spravato® or ketamine-assisted psychotherapy may be worth a conversation.
Small Things You Can Do This Season
None of these replace treatment, but they can make a real difference alongside it:
Chase the daylight. Get outside in the morning or at midday, even for 15 minutes. A walk along the river at lunch counts.
Keep your sleep steady. Try to wake up at roughly the same time every day, including weekends and holidays.
Plan one thing to look forward to each week. Seasonal depression hits anticipation hard, so put something small on the calendar on purpose: a coffee with a friend, a movie, a drive to see the lights.
Lower the bar on the holidays. You don't have to attend everything, buy everything or host everything. Pick the traditions that actually feel good and let some of the rest go.
Notice what still feels good. A hot drink on a cold morning. Fresh snow on the trees. The sound of a fire. Paying attention to small pleasures is a skill, and it's one worth practicing in the dark months.
Go easy on alcohol. It can feel like it helps in the moment, but it often makes sleep and mood worse.
Stay connected. Isolation feeds depression. Send the text, accept the invite, or tell one person how you're really doing.
How We Can Help
At Inner Journey, care for seasonal depression is structured and built around you. Depending on what you need, that may include psychotherapy (including CBT-I for sleep and EMDR), medication support, a medical look through our Primary Care and Consulting team to check for anything physical that might be affecting your mood, and, for depression that hasn't responded to other treatments, Spravato® or ketamine-assisted psychotherapy. All of it happens under one roof, in-office in downtown Missoula or by telehealth where appropriate.
We're in-network with Blue Cross Blue Shield of Montana, Allegiance, PacificSource, First Choice Health Network, Aetna, Missoula County Employee Benefits, Mountain Health Co-op and Medicaid. We are not in-network with Medicare.
If you've noticed the same slump showing up every winter, now is a good time to reach out. Treatment that starts early in the season can make the rest of it much easier.
The days will get longer again. In the meantime, you don't have to just wait it out.
Ready to talk? Call 406-541-2012 or email connect@innerjourneyhealthcare.com to schedule an intake. Learn more at www.innerjourneyhealthcare.com.
If you're in crisis or thinking about suicide, call or text 988 (Suicide & Crisis Lifeline), any time.
Education only, not medical advice. Talk with a qualified provider before starting light therapy or any new treatment.
