There's something I need to explain that I don't think gets talked about enough. And it's the reason so many high performers genuinely believe they're fine when they're anything but.
Cortisol is a liar.
Not literally, obviously. But the way cortisol functions in a chronically stressed body creates a false sense of normalcy that keeps people trapped in burnout for months or years longer than they need to be.
Here's what I mean. In a healthy stress response, cortisol spikes when there's a threat and drops when the threat passes. You feel the stress, you deal with it, you feel the relief. The cycle is clean and obvious. You know when you're stressed and you know when you're not.
In chronic stress, something different happens. Cortisol stays elevated for so long that your body recalibrates. The elevated level becomes your new baseline. Harvard Medical School's research on HPA axis dysfunction describes this as the stress response system getting "stuck" in an activated state. The hypothalamus keeps signaling, the pituitary keeps responding, the adrenals keep pumping. But because the elevation is constant rather than spiking, you stop feeling it as stress.
Read that again. You stop feeling it as stress.
This is why I have clients who sit across from me, clearly in Stage 3 or 4 burnout, and genuinely say, "I don't feel that stressed." They're not lying. They're not in denial (well, sometimes they are). Their cortisol levels have been elevated for so long that the elevation feels normal. The alarm bells have been ringing for two years and their brain has turned down the volume.
It's like living next to a highway. The first week, the noise is unbearable. After a month, you barely notice it. After a year, someone visits and says "how do you sleep with all this noise?" and you say "what noise?" The noise didn't stop. Your perception adapted.
This is exactly what happens with chronic cortisol elevation. The stress didn't stop. Your perception of it adapted. And that adaptation is dangerous, because it removes the warning signal that would normally prompt you to do something about it.
I see the consequences of this every week. A client whose resting heart rate has been 85-90 bpm for two years and thinks that's just "his normal." A client who hasn't slept more than five hours a night in eighteen months and has convinced herself she's "just not a big sleeper." A client who gets sick every six weeks like clockwork and blames it on "the kids bringing stuff home from school."
None of these are normal. All of them are signs of chronic sympathetic nervous system activation. But because the cortisol elevation happened gradually, the body adjusted its perception, and the person lost the ability to accurately assess their own state.
This is why I built the burnout assessment on my website. Not because a questionnaire is more accurate than self-awareness. But because structured questions can bypass the cortisol recalibration effect. When I ask someone "how often do you feel rested after a full night's sleep?" they have to answer honestly. And the honest answer often surprises them.
The Polyvagal Theory framework from Stephen Porges calls this "neuroception," the nervous system's unconscious assessment of safety and threat. In chronic stress, neuroception gets miscalibrated. The system reads threat as normal and normal as unfamiliar. Which is why the early stages of recovery often feel uncomfortable. Your body is returning to a state it hasn't been in for years, and that unfamiliarity registers as wrong even though it's actually right.
If you think you're handling your stress well, I'd ask you to look at the objective markers instead of your subjective feeling. What's your resting heart rate? How's your sleep quality (not duration, quality)? How often do you get sick? How's your digestion? How are your relationships?
Your feelings about your stress level are unreliable. Your body's data isn't.