BLOG

Physician-written perspectives on the latest research and the questions patients ask most. Start with the newest article below, or explore a topic.

Darrell Wilcox, MD 10/12/26 Darrell Wilcox, MD 10/12/26

Your Coffee Isn't Fixing Your Fatigue. It's Hiding It.

If more coffee keeps being the answer and the tiredness never actually lifts, that's not a caffeine tolerance problem. It's two different physiological states being treated as one.

Darrell Wilcox, MD 10/9/26 Darrell Wilcox, MD 10/9/26

The Control Room for Your Sleep: Two Signals, Fighting All Day, Deciding When You Crash

There are two competing signals deciding when you get sleepy, not one. Understanding them explains second winds, jet lag, and why you can be exhausted but wide awake.

Darrell Wilcox, MD 10/5/26 Darrell Wilcox, MD 10/5/26

Why You're Wide Awake at 2 AM (And It's Not Stress)

If you're suddenly wide awake at 2 AM and it started sometime in your 40s, it's probably not stress. It's a specific, measurable hormone mechanism.

Darrell Wilcox, MD 9/21/26 Darrell Wilcox, MD 9/21/26

Your Labs Might Be Showing a Sleep Problem, Not a Testosterone Problem

Most of your daily testosterone release happens during sleep. A single rough week can drop a lab result before anything's actually wrong.

Darrell Wilcox, MD 6/16/26 Darrell Wilcox, MD 6/16/26

Why You Stop Sleeping Deeply After 40 — And What the Growth Hormone Pulse Has to Do With It

Your deep sleep and your growth hormone don't decline separately — they decline together. Here's the mechanism most physicians never explain, and what the data shows about restoring it.