Seasonal Hormone Shifts: Why Fall Feels Harder for Some Women

Every September, the same thing happens in my exam rooms. A woman sits down, a little embarrassed, and says something like, "I don't get it. Summer was fine. Now the mornings feel heavy, I'm wired at 2 a.m., and my patience is gone by four." She's braced for me to say it's stress, or her schedule, or just getting older. Sometimes it is. But more often than most people realize, the season itself is part of the story.

I'm Dr. Farhan Abdullah, an internal medicine physician, and at Magnolia Functional Wellness in Southlake I spend a lot of my day talking with women about hormones, sleep, mood, and energy. Fall is when those conversations multiply. So let's talk about why the shift from summer to autumn can hit some women harder than others, what's actually going on underneath, and what you can reasonably do about it.

Your Body Keeps Time by Light

Long before we had calendars, human biology ran on daylight. Your brain has a master clock that reads light coming through your eyes and uses it to set the rhythm of nearly everything: when melatonin rises, when cortisol peaks, when you feel sleepy or sharp. That system doesn't care that you have a school pickup line and a 9 a.m. meeting. It only knows the sun is coming up later and going down earlier.

As days shorten in the fall, the timing of melatonin release shifts. Your morning light exposure drops, especially if you're commuting in the dark or working indoors. For a lot of people this is a nuisance. For others it's the start of a real slide in mood, energy, and sleep quality. Cortisol, your main daytime alertness hormone, is tied to that same clock. When the rhythm gets blurry, you can feel tired and wired at the same time, which is exactly what so many of my patients describe.

Here in North Texas we don't get the dramatic darkness that northern states do, and I'll admit that fools people. They assume that because it's still 85 degrees in late September, nothing could possibly be changing. But your circadian system responds to day length, not to the thermostat. The light is changing whether or not the weather cooperates.

Why Women Seem to Feel It More

Research on seasonal mood changes has pointed in a consistent direction for decades: women are diagnosed with seasonal affective disorder more often than men, in study after study, across different countries and populations. I don't want to overstate what that means. Diagnosis rates don't tell us everything, and plenty of men struggle with the dark months too. But the pattern is real enough that I take it seriously in practice.

Why might that be? Nobody has a complete answer yet, and I'd be skeptical of anyone who claims to. What we do know is that estrogen and progesterone don't just run your cycle. They act on the brain. Estrogen influences how serotonin is made, released, and cleared. Progesterone's byproducts interact with the same receptors that calm your nervous system and help you sleep. So when estrogen and progesterone are steady, your mood and sleep systems have a kind of cushion. When those hormones are fluctuating or declining, as they do throughout perimenopause and menopause, the cushion gets thinner. Then something like a change in daylight, which a younger, hormonally steadier version of you shrugged off, can tip things over.

That's my working theory from clinical experience, and I hold it loosely. What I can say with confidence is this: I see the fall dip most often in women in their late thirties through their fifties, which is precisely the window when hormones start to wobble.

The Perimenopause Piece Nobody Mentions

Let me be blunt about something. A lot of women in their forties get told their fall slump is "seasonal depression" or "burnout" when perimenopause is quietly running the show. The two overlap so much that it's hard to untangle without a proper look.

Consider what perimenopause tends to do. Estradiol swings up and down, sometimes wildly, rather than declining in a neat line. Progesterone often falls first. Sleep gets choppy, with those 3 a.m. wake-ups that feel like someone flipped a switch. Night sweats, anxiety that seems to come from nowhere, irritability, brain fog. Now layer shorter days on top of that. If your sleep is already fragile, losing morning light and gaining earlier darkness can push you from "tired but functional" to "I don't recognize myself."

What I tell my patients is that the season can be the trigger, but it's rarely the whole cause. If the same symptoms show up every fall and don't fully clear in the spring, or if they're getting worse year over year, that's a sign to look deeper rather than simply push through another winter.

The Other Suspects Worth Checking

Hormones aren't the only thing that changes in autumn, and a good evaluation doesn't fixate on one explanation. A few others I routinely look at:

• Vitamin D. Sun exposure drops as the days shorten, and levels commonly fall through the fall and winter. Low vitamin D has been associated with fatigue and low mood, though the research on supplementing it for depression is mixed, so I check the level and treat a real deficiency rather than assuming.
• Thyroid function. An underactive thyroid can mimic nearly everything on this list: fatigue, low mood, weight gain, feeling cold. It's common in women and easy to miss if only a TSH gets checked in isolation.
• Iron and ferritin. Menstruating and perimenopausal women often run low, and it shows up as exhaustion and poor concentration.
• Sleep itself. Untreated sleep apnea becomes more common in women after menopause, and it wrecks mood and energy. Sometimes what looks like a hormone problem is a breathing problem at night.
• Life load. September is brutal for parents. New schedules, sports, homework, the holidays looming. Real stress is real, and I'd never wave it away.

This is why I don't love the "just get a light box and a vitamin" advice, even though light and vitamin D have their place. It skips the question of whether something measurable is going on. If you've been told your labs are "normal" but you still feel off, our guide on women's hormone imbalance when labs come back normal walks through why that happens and what a fuller workup looks like.

What You Can Do Starting This Week

Before we talk about anything medical, the basics do more than people give them credit for. None of this is glamorous, and all of it works better than the average supplement aisle.

Get bright light early. Ten to twenty minutes outside within an hour of waking anchors your circadian clock better than almost anything else. Drink your coffee on the patio, walk the dog around the neighborhood, take a lap at Southlake Town Square before your first meeting. Outdoor light, even on a cloudy morning, is far stronger than what you get indoors.

Protect your sleep window. Keep a consistent wake time, including weekends. Cool the bedroom down, since heat is a major trigger for perimenopausal night waking. Watch alcohol, which many women find worsens both hot flashes and 3 a.m. wake-ups. Dim the lights in the evening so your melatonin can do its job.

Move your body, and include strength training. Regular exercise supports mood, sleep, bone density, and insulin sensitivity, all of which matter more as hormones change. Lifting something heavy twice a week is one of the best investments a woman over forty can make.

Eat like it matters. Steady protein, plenty of fiber, and not skipping meals help keep blood sugar and mood steadier through the day. I'm not going to give you a rigid plan, but a real breakfast beats a coffee and a sigh.

Tell someone. If your mood has dropped in a way that's affecting your work, your relationships, or your sense of hope, please don't wait for it to pass. Talk to a clinician you trust. If you're ever having thoughts of harming yourself, contact the 988 Suicide and Crisis Lifeline right away.

When Hormone Therapy Enters the Conversation

For some women, the honest answer is that lifestyle changes aren't enough because the underlying issue is hormonal. In that case, it's worth asking whether hormone therapy is appropriate for you. I want to be careful here, because this is a decision that should be individualized, not a fall promotion.

For women in perimenopause or menopause who are dealing with hot flashes, night sweats, disrupted sleep, and mood changes, menopausal hormone therapy is an established option that can help with those symptoms. It isn't right for everyone. Your personal and family history matters, particularly around breast cancer, blood clots, heart disease, and stroke, and the type, dose, and delivery method all make a difference. That's exactly why I start with a thorough history and a proper lab review rather than a one-size-fits-all approach, and why the goal is always the lowest dose that does the job, monitored over time.

Hormone therapy also won't fix everything. If your fall slump traces back to low vitamin D, a sluggish thyroid, or sleep apnea, then hormones aren't the answer, and I'd be doing you a disservice to suggest otherwise. Part of my job is telling you when hormones are not the problem. If you're curious how we approach it, you can read more about women's hormone replacement therapy in Southlake.

A Pattern Worth Paying Attention To

Here's the one thing I'd leave you with. Notice whether this is a pattern. Grab your phone and think back over the last two or three autumns. Did your sleep fall apart around the same time? Did your mood, your motivation, your patience dip in October and lift in April? Write it down. A repeating seasonal pattern is useful information, and it gives us something concrete to work with rather than a vague sense that you're "just off."

You don't have to accept feeling worse for a third of the year as the price of living in a body that changes. Sometimes the fix is as simple as morning sunlight and a better bedtime. Sometimes it's a lab you haven't had drawn. Sometimes it's a conversation about hormones. At Magnolia Functional Wellness in Southlake, we'd rather figure out which one it is than have you white-knuckle your way to spring.

By Dr. Farhan Abdullah, DO | Medical Director, Magnolia Functional Wellness | Southlake, TX