Why High Performers Can’t Switch Off at Night Despite Their Success: Stress, Sleep Disturbances, and Your Brain

Moments of Happiness in April

April often brings a sense of momentum. More light, more energy, more movement. And for many, also more speed. At the same time, in conversations, sessions, and quiet moments, I keep hearing something else:

“I’m tired when I wake-up.”

Thoughts that don’t stop. A body that won’t settle. A system that is exhausted yet unable to switch off.

Especially for people who achieve a lot, think a lot, and carry a lot, this becomes very visible. External success does not automatically create internal calm.

Sleep is not just a sleep problem

Sleep disturbances are often treated in isolation. Too little sleep. Poor quality. Too much screen time.

But from a nervous system perspective, sleep is not a standalone issue. It is a state that can only emerge when the system is able to downregulate.

When that doesn’t happen, it’s rarely because we are “sleeping wrong.” It’s because the body no longer accesses the mode that allows sleep in the first place.

Stress plays a central role here. Not only obvious stress. But also functional, performance-driven stress that often feels normal for a long time.

What happens in your brain when you can’t switch off

From a neuroscientific perspective, chronic stress is not abstract. It is measurable.

Cortisol, the body’s primary stress hormone, follows a natural rhythm. It rises in the morning to help us wake up and gradually declines throughout the day. Under chronic stress, this rhythm becomes dysregulated.

Research shows that elevated cortisol levels are associated with sleep disturbances, frequent nighttime awakenings, and reduced sleep quality (Meerlo et al., ScienceDirect 2008). At the same time, the amygdala, which is responsible for emotional processing and threat detection, remains more active. The prefrontal cortex, which supports regulation and clear decision-making, becomes less effective.

This leads to: More thinking. Less clarity. More internal activation, but with less control.

Or simply: The body is tired. But the brain is still “on.”

When performance becomes a constant state

This is something I know very well. As someone who is highly driven, sleep was a recurring theme for years.

Business travel to Asia, jet lag, intense training phases, professional pressure. Each manageable on its own. Together, a constant load on my system.

I often couldn’t fall asleep. Or I woke up in the middle of the night and unable to return to sleep. My mind would immediately switch on. Solving problems, drafting emails in my head, running through endless to-do lists.

Part of me even wanted to get up and continue working.

Functioning on the outside. Increasingly exhausted on the inside.

At some point, I noticed I was no longer able to make clear decisions the way I used to.

Why high performers are especially affected

What often goes unnoticed:

The very strategies that create success can overload the nervous system.

• Control

• Discipline

• Endurance

• Optimization

All of these work well externally. Internally, they can create the opposite effect.

Because sleep cannot be forced. It emerges when safety, regulation, and letting go are possible. And that is often the hardest part.

Small changes, big impact

Through years of training, conversations with neurologists, coaches, and deep personal work, I realized:

My lifestyle was not supporting my system, it was adding more stress.

So I started to change things. Gradually.

The first step:
No coffee after 10 a.m.
One of the hardest adjustments for me.

The second:
No fasted training and no coffee on an empty stomach.

Research shows that cortisol naturally rises about 30–45 minutes after waking (Clow et al., 2010). Adding stressors like caffeine or intense exercise during that window can amplify the stress response.

I began to change how I start my day. Slower. More intentional. Less reactive.

And eventually, the rest of my day as well.

Sleep does not start at night

One of the most important insights for me was this:

• Sleep does not begin when you go to bed.

• It begins in the morning.

• In how you wake up.

• How you move through your day.

• How much stimulation your system processes.

And most importantly: Whether there are moments of regulation – not just performance.

A different perspective on sleep problems

Maybe the goal is not to optimize sleep. Maybe it is to understand what your system actually needs.

• Less pressure.

• More regulation.

• Less constant doing.

• More conscious transitions.

Or as I would say today:

“Sleep is not something you achieve.
It is something that happens when your system feels safe.”

Reflection

You might take a moment to ask yourself:

• When during the day does my system feel truly calm?

• Where am I constantly “on”?

• What would change if I didn’t wait until the evening to slow down?

It doesn’t always take big changes.