Why You Feel Anxious, Exhausted and Unable to Switch Off

Nervous system regulation, brain fog, burnout, overthinking, relationships, breakups, sleep and why you sometimes just don't feel like yourself.

12 MIN READ · UPDATED SEPTEMBER 2026

You sleep, but still wake up tired.

You finally get a quiet night, but your brain won't stop thinking.

Someone takes hours to reply to your message and suddenly you can't concentrate on anything else.

You know the relationship wasn't right, but after the breakup your body seems to want that person more than ever.

You're forgetting names. Losing your keys. Opening your phone and forgetting why. Reading the same sentence three times.

Or maybe nothing is obviously wrong.

You're functioning. You're working. Parenting. Building. Training. Answering messages. Showing up for everyone.

But underneath all of it, you feel wired, overwhelmed, irritable, foggy or completely exhausted.

And this is where a phrase you've probably seen everywhere enters the conversation:

It's become one of the biggest conversations in modern wellness.

But behind the trend is a genuinely useful question:

What happens when your mind and body spend too much time responding to stress — and not enough time recovering from it?

What is nervous system regulation?

Your nervous system is constantly processing information about what is happening inside you and around you.

When something requires your attention, your body's stress-response systems can increase alertness and prepare you to respond.

That's not inherently bad.

You need activation.

You need it to meet a deadline, run for the train, play sport, respond to danger, have a difficult conversation or perform under pressure.

The problem is when the demands keep coming and the recovery doesn't.

Stress can involve hormones including adrenaline and cortisol. Persistent stress can also affect how people feel physically and emotionally, including sleep, concentration and exhaustion.

Activate when you need to.

Recover when you don't.

12 signs you're carrying more stress than you realise

Stress doesn't always look dramatic.

Sometimes it looks like being incredibly productive while feeling terrible.

None of these symptoms by themselves proves you have a “dysregulated nervous system.”

Anxiety, sleep problems, hormonal changes, medications, nutritional deficiencies and medical conditions can create overlapping symptoms.

But they're signals worth paying attention to.

Why can't I stop overthinking?

You know the conversation is finished.

But apparently your brain didn't get the memo.

This repetitive return to distressing thoughts or experiences is often described as rumination.

And the important thing to understand is that mental stress and physical stress aren't necessarily two completely separate worlds.

Your thoughts can affect your sleep.

Poor sleep can affect your ability to concentrate.

Reduced concentration can make your workload feel harder.

And feeling overwhelmed can give your brain even more material to think about at 1:00 in the morning.

Why does a breakup feel physically painful?

This is where the nervous-system conversation becomes particularly interesting.

You've ended the relationship.

Logically, you understand why.

You've made the pros-and-cons list.

You've spoken to your friends.

You've deleted the photos.

Maybe you've even blocked them.

And yet some part of you is screaming:

A breakup isn't only an intellectual decision.

It can involve loss, uncertainty, rejection, disrupted routines, loneliness, rumination, changed sleep and the disappearance of a familiar source of connection.

Your mind can understand why something ended before your emotional response has completely settled.

Sometimes missing someone simply means you're adjusting to their absence.

Those aren't necessarily the same thing.

Why do I want someone more when they pull away?

They're interested.

You're relaxed.

Then suddenly they're distant.

Now you're interested.

They take longer to respond.

You check your phone.

They send one affectionate message.

Relief.

Then silence.

Anxiety.

Then another message.

Relief.

Eventually your attention can become completely occupied by someone you weren't even thinking about that much a few weeks earlier.

Instead of only asking:

“How strongly do I feel about this person?”

try asking:

“How do I consistently feel when I'm around this person?”

Do you feel respected?

Can you communicate?

Can you still concentrate on the rest of your life?

Can you be yourself?

Or are you constantly interpreting, checking and waiting?

Emotional intensity isn't the only information available to you.

Why does no contact feel so hard after a breakup?

Because you're not simply stopping communication.

You're interrupting a pattern.

No morning message.

No checking whether they're online.

No goodnight call.

No weekend routine.

No random meme.

No quick reassurance that they're still there.

Suddenly there's a gap.

And the temptation is to interpret the discomfort as:

But another possibility is:

Those are very different conclusions.

The space left by a relationship eventually has to be filled with something else.

Movement. Friends. Sleep. Work. Faith. Travel. Creativity. Nature. Training. Learning. New experiences.

And eventually, yourself.

Burnout doesn't always look like collapsing

When people imagine burnout, they often picture someone who can't get out of bed.

But some overwhelmed people remain extraordinarily productive.

They run companies.

Raise children.

Train.

Meet deadlines.

Answer everyone.

Keep the household functioning.

Smile when somebody asks how they're doing.

And slowly notice that everything requires more effort than it used to.

Why am I tired even after sleeping?

Eight hours in bed doesn't automatically mean you feel restored.

Imagine spending your entire day switching between:

notifications, work, conflict, money, relationships, social media, decisions, planning, worrying and solving problems.

Then at night you put your phone down and expect your brain to instantly become peaceful.

Sometimes it doesn't work that way.

Persistent fatigue can also have medical causes, so ongoing or unexplained exhaustion shouldn't automatically be attributed to stress.

Brain fog: why can't I think clearly anymore?

You walk into a room.

Why did I come in here?

You open your phone.

What was I doing?

Someone introduces themselves.

Thirty seconds later:

What was their name?

You read a paragraph and realise none of it entered your brain.

People commonly describe experiences like these as brain fog.

Brain fog isn't itself a single medical diagnosis.

It's a description of difficulties involving things such as concentration, memory and clear thinking.

Stress and poor sleep can contribute, but so can other factors including illness, medications and hormonal changes.

ADHD, overwhelm and the nervous system

ADHD deserves its own distinction here.

ADHD isn't simply a “dysregulated nervous system,” and nervous-system regulation isn't a replacement for appropriate ADHD assessment or care.

But people with ADHD can experience challenges involving attention, task initiation, switching tasks, stimulation and emotional regulation.

And when someone already feels overwhelmed, adding another elaborate productivity system can sometimes just create another thing to manage.

What about “cortisol face”?

You've probably seen this one on TikTok.

Puffy face?

Tired eyes?

Someone in the comments says:

“That's cortisol face.”

Cortisol is a real hormone involved in the stress response.

But you can't reliably diagnose someone's cortisol levels by looking at their face on social media.

Sleep, fluid retention, diet, alcohol, medications, hormones, allergies and medical conditions can all affect appearance.

A much more useful question is:

How to regulate your nervous system naturally

There isn't one magical nervous-system reset.

Think instead about reducing unnecessary load and improving recovery.

The goal isn't to become calm all the time

This may be the biggest misunderstanding in the nervous-system conversation.

You're not trying to turn yourself into a permanently relaxed human.

You want range.

That's a far more useful way of thinking about regulation.

And sometimes wellness itself becomes too complicated

Ironically, trying to feel better can become another full-time job.

One capsule when you wake up.

Another with breakfast.

Powder before training.

Something else at night.

Another bottle you forgot to reorder.

Another person online recommending another ingredient.

Eventually your wellness routine requires project management.

Frequently asked questions

CLEAR. STEADY. CALM.

One simple ritual. Less to think about.