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Every year around this time, patients come into my office and say something like:
“Doc, I don’t know why, but I just don’t feel right.”

They’re more tired. They’re irritable. They can’t think as clearly. Some even worry something serious is going on. But most of the time, it’s not a disease. It’s September.

Your brain notices the change of season even if you don’t. Shorter days, new routines, the rush of school and work starting back up all of it puts pressure on your body’s internal rhythms.

After 35 years of practicing medicine, I’ve seen this pattern over and over again. And I can tell you this: the brain is resilient, but it does best when we respect its cycles.

How the Season Affects the Brain

Your Body Clock Shifts
The brain has a clock inside it. It listens to light. When the sun sets earlier, melatonin starts rising sooner, and your sleep cycle shifts with it. People tell me they feel groggy in the morning or can’t fall asleep at night. That’s not your imagination, it’s your brain adjusting to a new schedule.

Stress Picks Up
Summer has a slower pace. Then September hits: traffic, work deadlines, school routines. The brain’s “executive center,” the part that handles planning and focus, gets overloaded. Patients notice they’re forgetful or snapping at family. I hear this every fall.

Mood Changes
Even here in Florida, I see people go through a September slump. Less daylight can affect neurotransmitters like serotonin. That dip in brain chemistry shows up as lower energy, motivation, or mood.

A Story from My Practice
One of my patients, a man in his sixties, came in every September complaining of fatigue and a general sense of malaise. We ran his labs. Everything looked fine. Finally, I asked him about his routine. In the summer, he spent evenings outside. In September, he stayed indoors working later. That one change in light and activity was enough to throw his system off balance. Once he made the adjustment, the symptoms faded.

Sometimes the brain whispers. If you ignore it, the whispers can turn into something louder.

What Helps

Here are five simple things I often recommend this time of year:

1. Get outside in the morning. Ten minutes of sunlight soon after waking can reset your clock.
2. Keep a consistent sleep schedule. Go to bed and wake up at the same time, even on weekends.
3. Cut the late-night screens. The blue light tricks your brain into thinking it’s still daytime.
4. Move daily. A walk, a bike ride, or any physical activity improves mood chemistry.
5. Stay on top of preventive care. September is the perfect time to schedule your physical or vaccines before the holiday rush.

My Advice

If you feel “off” this month, you’re not alone. It doesn’t always mean something is wrong—it often means your brain is adapting. But if the fatigue, headaches, or mood changes don’t ease up, that’s the time to take a closer look.

The earlier we address small shifts, the easier it is to prevent bigger problems down the road.

So, think of September as a reset. Take care of your brain. Listen when it nudges you. And if you need help sorting it out, I’m here to help. Please call my office for a personalized appointment at 239-985-1050.

Disclaimer: This content is intended for general informational and educational purposes only. It should not be taken as medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare professional with any questions you may have about your health or a medical condition.