Why You Still Feel Exhausted — Even After the Holidays (And How to Reset Your Energy This Year)

Bradford Perkins, MD

Expert Contributor | Bradford Perkins, MD, a SignatureMD Physician Bradford Perkins, MD, a SignatureMD Physician

Cambrian Neighbors Jan 2026

Every January in my Los Gatos clinic, I hear the same thing from patients across Cambrian, Willow Glen, and Almaden: “I thought I’d feel better after the holidays, but I’m even more exhausted.”
If you’re starting the new year drained instead of refreshed, you’re not alone — and there are real biological reasons behind it.

Here are the most common patterns I see, and what you can do to start feeling like yourself again.

Your Stress System Never Fully Turned Off

The holidays bring joy, but they also disrupt routines with late nights, travel, richer foods, social obligations, kids out of school, and year-end work pressure. All of this keeps your nervous system in a heightened state.

When cortisol stays elevated, it creates a “tired but wired” feeling: shallow sleep, middle-of-the-night awakenings, anxious mornings, and low energy throughout the day. Many people are surprised to learn that their fatigue has less to do with motivation — and more to do with stress physiology.

Shorter Days and Less Natural Light Affect Your Energy

January brings the least daylight of the year — and this matters more than most people realize.
Low morning light exposure affects:

your circadian rhythm
cortisol timing
melatonin production
mood and motivation

When your internal clock drifts later due to lack of light, you may wake up groggy, feel unfocused in the afternoon, and get a second wind late at night. Even 5–10 minutes of outdoor sunlight in the morning can reset these rhythms and improve energy quickly.

Midlife Hormone Changes Happen Quietly

For women in their 30s through 50s, subtle shifts in estrogen and progesterone can create:

low energy
brain fog
irritability
disrupted sleep
unpredictable cycles

These changes often begin years before periods become irregular.

For men, even modest changes in testosterone or increases in SHBG can affect mood, energy, recovery, and metabolism — often long before labs look “abnormal.”

Your Mitochondria Need a Post-Holiday Reset

Your mitochondria are the tiny power plants inside your cells. When they become overwhelmed by stress, inflammation, nutrient depletion, or illness, you may experience sluggish mornings, afternoon crashes, cravings, and slower recovery. The holidays place real metabolic pressure on these systems — but they can be supported and rebuilt.

How to Actually Reset Your Energy This Month

• Get morning sunlight + a short walk
This stabilizes cortisol and improves natural daytime energy.

• Add protein to breakfast
It balances blood sugar and reduces energy crashes.

• Reduce evening alcohol
Even one drink affects sleep depth and next-day energy.

• Support your mitochondria
NAD+, B-vitamins, magnesium, and targeted peptides can meaningfully improve cellular energy.

• Check your hormones and metabolic markers
If you’re “doing everything right” but still exhausted, deeper testing often reveals the real reason.

A Fresh Start for the New Year

If you’re feeling more tired than expected this January, nothing is wrong with you — your biology just needs a reset. With the right guidance, your energy, clarity, and motivation can return faster than you may think.

Wishing you a healthier, more energized start to the new year.

Dr. Bradford Perkins is a board-certified Family & Obesity Medicine physician specializing in hormones, metabolism, longevity, and stress recovery at Transform Wellness Clinic in Los Gatos.