Overthinking at Night: Why Your Brain Won’t Shut Off When Your Body Is Exhausted

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Dr. Brighten: Hey friend, welcome back. I want to invite you to pull up a chair, get cozy, and let's take a collective deep breath together because today we are tackling a quiet epidemic that is keeping millions of women exhausted, lonely, and staring at their ceilings in the dark night after night. So take that breath and I want you to picture this.

Ten forty-seven PM, dishes are finally in the dishwasher. Kids are asleep. The house is finally quiet. The emails are paused until tomorrow, and then you crawl into bed, pull the covers up to your chin, and for the very first time all day long, absolutely nobody needs anything from you. That's a good feeling, right?

But then right on cue, the exact second your head hits the pillow, your brain decides to hold an emergency corporate board meeting. It's not a quick check-in. [00:01:00] It's a full presentation with no agenda and no end time. And suddenly you're replaying the text message you forgot to return, the dentist appointment that you need to schedule, and the slightly awkward thing that you said to a coworker three days ago, but now it's like the worst thing that you ever did.

And then your brain decides to show off its range, jumping seamlessly from tomorrow's grocery list to an existential crisis about your entire future. Your physical body's utterly spent, right? But your mind is running a marathon, and you just can't get to sleep. And you lie there and you're thinking, "Why can't I just turn this off?

What's wrong with me? Where's the switch for my brain? Did I lose it somewhere?" If you've lived this script once, twice, maybe a thousand times, I want you to hear me loud and clear before we go a single step further You're not lazy, you're not failing at [00:02:00] meditation or mindfulness, and you are not broken because peace feels impossible to access.

Most health advice frames this purely as a sleep hygiene problem. They'll tell you, you know, wear your blue light-blocking glasses, uh, you know, stay off your screens, drink chamomile tea. All, all valid, but as a doctor, I look at this through a completely different lens. What if your brain isn't refusing to turn off?

What if it simply doesn't feel safe enough to close its eyes? Today, we're gonna dive deep into why the quietest moment of your day often becomes the loudest moment in your head. We're going to look at your nervous system, your hormones, and a massive missing piece for millions of women: undiagnosed or unsupported ADHD.

By the time we finish our conversation today, you aren't just going to have a list of more things to do. I get it. We don't always just need more [00:03:00] things to do. In fact, you're gonna have an understanding of your physiology so deeply when you walk away from this conversation, that you will realize you've actually been doing an incredible job at protecting yourself.

You're going to feel a profound sense of accomplishment just for realizing how smart your body has been all along And that is my hope for today's episode for you

Welcome back to The Dr. Brighten Show. I'm your host, Dr. Jolene Brighten. I'm board certified in naturopathic endocrinology, a certified menopause practitioner, a certified sex counselor, and I'm the author of the upcoming book, ADHD and Women. If you find a moment of peace or an aha moment at all in today's episode, please just take a quick second to like, comment, share, subscribe.

This helps this podcast reach the people who need it, and certainly pass this to the friend who is likely awake at 11:00 PM overthinking right along with you. Now, [00:04:00] let's talk about what is actually happening beneath those racing midnight thoughts

. when we find ourselves overthinking at night, we treat the thoughts themselves as if they're the enemy, and we try to think our way out of thinking. I know it sounds silly, right? But it's literally what we're doing. But a hyperactive mind at midnight is rarely just about the random thoughts. It's about a deeply ingrained sense of survival and responsibility.

When a patient sits across from me and says, "Dr. Brighten, I just can't shut my brain off," I don't see someone who's just casually worrying for fun. I see a woman who has been on high alert duty all day long, sometimes for years on end. You aren't analyzing things because you want to. It's not a choice.

You're analyzing them because a fundamental part of your subconscious believes that if you stop tracking the variables, something catastrophic will fall apart. And frankly, your brain is [00:05:00] entirely justified in believing that. If you are the person who remembers the birthdays, you anticipate the grocery shortages, you notice when a family member is having a bad day, and you're the one who fixes operational crises before anyone else even registers there's a problem, your brain has learned that vigilance is a highly successful strategy.

It builds a neural pathway that says, "Keep scanning, keep anticipating, keep everyone safe." And that has evolutionary benefits, right? But at eleven PM, you suddenly ask your brain to drop its guard, to soften. It doesn't know how. It's like asking a highly trained guard dog to instantly transform into a sleepy lap dog just because you changed rooms.

It is still on shift. It's still on duty. So let me ask you a really honest question. When was the last [00:06:00] time you felt truly, entirely off duty? I don't mean scrolling social media while mentally building tomorrow's to-do list. I don't mean taking a bath while keeping one ear open for someone calling your name.

I mean zero things to manage, zero things to prove, and zero expectations to meet. For most women, that question brings an uncomfortable silence because the honest answer is most of us have no idea. If that's you, I want you to congratulate yourself right now for recognizing it.

Acknowledging that your brain has been working overtime to protect your life is the very first step in reclaiming your peace. Your brain is not broken. You're not dysfunctional. Your brain, it's just incredibly loyal to your survival.

Over time, however, this constant hypervigilance leads to an unspoken, dangerous agreement inside our minds. If I can just stay five steps ahead [00:07:00] of everything, nobody will be disappointed in me. If I keep overthinking, I can maintain control. This is precisely where we have to bring ADHD into the conversation, because millions of adult women are walking around with brains that function this way without ever realizing they have a neurodivergent profile.

Think back to your childhood. The medical model historically has missed girls with ADHD because they weren't little boys bouncing out of their school chairs. Instead, the girls were often the daydreamers, the perfectionists, the hyper talkative ones, or the ones who seemed incredibly capable on the outside, gifted student, honor roll, but felt absolutely like a chaotic whirlwind on the inside Now, if that was your experience, you learned a very specific coping mechanism to survive a neurotypical world.[00:08:00] 

You learned to use internal pressure and anxiety as your primary organizing system and motivation. You learned that urgency could be used as fuel. Anxiety became your calendar reminder app. Fear of failure, that became the backup plan, right? You literally trained your nervous system to produce stress chemicals just to get the mundane tasks done.

And at a very young age, the little girl inside you, she learned that mistakes were not just unacceptable, mistakes were dangerous. So when the physical world finally gets quiet at night, your brain begins to panic. To an ADHD brain that has relied on high-stakes adrenaline to function all day, absolute quiet doesn't feel like peace.

It feels like a sensory vacuum. It feels dangerous. So it manufactures thoughts to [00:09:00] create the internal stimulation it thinks it needs to stay safe. And this can happen to anyone, not just ADHDers, okay? Now, when you look at it through this lens, you realize something really liberating. Sometimes an overthinking brain isn't anxious, it's overburdened.

It has been running on an old survival script for so long that constant movement feels like the only way to stay alive. Just understanding that fact means you are no longer fighting yourself. You are finally starting to decode your unique mind and how it actually works And like I said, this doesn't just happen to ADHDers.

We see this in perimenopause. We see this with people who have PTSD. We see this in chronic HPA axis dysregulation. So let's look at this now through a physiological lens, because this is where my doctor brain gets incredibly [00:10:00] passionate. We've all seen two people handle the exact same level of stress completely differently.

One person has a chaotic day, hits the pillow, falls asleep four minutes flat. Another person, through the same exact day, lies awake replaying every single interaction since breakfast. Why is that? Is the first person just better at meditating? Are they just more disciplined? Are they better at life? That's not the answer.

It's absolutely not the answer. The difference isn't a lack of willpower. It's a reflection of the biological capacity. Your mind is not a separate entity floating above your body. Your thoughts are quietly manufacturing your biochemistry, and your biochemistry is shaping your thoughts. So when a woman tells me that she feels wired but tired, that isn't a psychological complaint.

It's a classical medical description of a nervous system stuck in a specific phase of [00:11:00] stress response, what we call HPA axis dysregulation, how the brain and the adrenal glands are communicating. Normally, your body relies on a beautiful cortisol curve. It's high in the morning to give you energy, and then it tapers off smoothly in the evening so that melatonin can take over and guide you into deep sleep.

But when you experience chronic unremitting stress, that curve, it gets flipped. Your body pumps out cortisol late in the evening, leaving you physically exhausted but biologically wide awake. At the ex-exact same time, your brain is tracking your blood sugar. If you skipped lunch because you were too busy taking care of everyone else, or if you ate a quick carb-heavy dinner on the run, your blood sugar can crash at two to three AM, spiking cortisol all over again.

When your blood sugar or glucose drops, your brain interprets that drop as immediate starvation [00:12:00] emergency. It instantly secretes a surge of adrenaline and cortisol to raise your blood sugar back up. Suddenly, you're awake, cold sweat. Your heart is racing, your brain is racing, and your brain is immediately looking for a problem to solve because your biochemistry, your hormones, just told it you are in immediate danger, and that's when we see you wake up feeling exhausted.

You don't wake feeling rested 'cause cortisol's not rising in the morning the way it should either. Now, look at what we just unraveled here together. You thought you were waking up and staying awake because maybe you thought you were an anxious overthinker or, um, that you just can't handle stress. In reality, you have a brilliant brain.

It was simply reacting to a drop in blood sugar and a dysregulated cortisol curve. It was doing exactly what it evolved to do to keep you alive. Just knowing that is gonna shift you from self-blame [00:13:00] to that clinical clarity of what is actually happening in your body. Let's take this one step deeper, further into endocrinology or hormones.

Because if you're a woman navigating perimenopause or maybe you're postpartum, maybe you're just in the luteal phase about to get your period, or maybe you're a mom and you're watching this play out in your young daughter who's going through puberty, I need you to understand your hormones. They're radically shifting the way your brain is processing your thoughts.

There is a powerful, intimate dance between estrogen and dopamine. Estrogen acts as a master key in the female brain. It directly supports the synthesis and signaling of dopamine, which is the exact neurotransmitter responsible for focus, impulse control, working memory, emotional regulation. When your estrogen levels are steady or even high, your dopamine system functions smoothly.

It's easier to prioritize [00:14:00] thoughts, put worries in a box, and tell your brain, "We will handle that tomorrow." But when estrogen begins to fluctuate wildly, or it's permanently dropping, or it's, you know, being challenged by progesterone, your dopamine levels, they're gonna take a massive hit, as are your serotonin levels, your acetylcholine levels, and we can even see histamine being affected.

For a woman with a neurodivergent or a hormone-sensitive brain, this drop can feel like the ground is shifting under her feet, or maybe the ground just like just bottomed out below her Suddenly, the internal scaffolding you built over decades to keep your life together, it starts to crack. The sticky notes don't work anymore.

The digital calendars start to fail. Your working memory gets foggy. Your ability to filter out irrelevant background thoughts and noise, it completely erodes. You're becoming more sensitive to the environment. This is exactly the picture that so many perimenopausal [00:15:00] women describe. And what do most women do when this hormonal shift occurs?

They blame themselves. They say, "I used to be so organized. Now I'm completely scattered. I must be losing my edge. Like, what's wrong with me? Am I just getting old? Is this the way life is always going to be?" But what if this isn't you falling apart? What if this is your body simply asking for a completely new level of biological support?

I mentioned estrogen, but progesterone plays a massive role here too. Progesterone metabolizes into a compound called allopregnanolone, which crosses the blood-brain barrier and binds directly to GABA receptors. GABA is your brain's natural built-in Valium. It's the chemical that creates a sense of deep physiological calm.

When progesterone drops in your thirties, forties, you start to lose the biological buffer. When you combine a drop in your brain's natural calming [00:16:00] agent with a drop in your dopamine, your midnight brain isn't being difficult, and you're not being dramatic about this problem either. Your brain is responding to a shifting chemical environment, and this shifting chemical environment is not a character flaw, okay?

This is the explanation of what is happening, and explanations are incredibly liberating because they prove your brain is not the enemy, your hormones are not the enemy, and you are not the problem. So my brilliant friend, let's talk about the ultimate reframe I want you to carry with you into bed tonight. You are not bad at resting. You're not bad at leisure time. You're not bad at turning off. You are simply a person who has been rewarded for a very long time for staying on high alert. Your brain is not broken or dysfunctional.

It has been fiercely, loyally trying to protect you and keep your entire world spinning day after day. 

What if what you've been calling [00:17:00] overthinking is actually just a beautiful but tired nervous system that has temporarily forgotten what safety feels like? The goal here isn't to bully your mind into absolute silence. It isn't about mastering the perfect meditation technique or scolding yourself when thoughts pop up.

The goal is to gently show your brain that it's allowed to step down from its post, take some time off. The next time you're lying awake and the thoughts start rushing in like a tidal wave, as they do, I want you to take your hand, place it on your heart, and ask a few compassionate questions to yourself.

What is my brain working so incredibly hard to protect me from right now? What heavy responsibility am I still carrying under the covers with me? Is it safe for me to let go of the world for the next seven, eight, nine hours? Real rest is not just about closing your physical eyes.

True rest only [00:18:00] happens when your nervous system feels completely held, when it knows deep in its marrow that the universe will not fracture into pieces if you stop managing it until tomorrow morning. You are allowed to be a human being. Okay, that just needs to be said. You are allowed to be a human being, not just an operating system that keeps everyone else functioning

And if you do need deeper support, I do have other episodes with protocols to help you get the sleep you desire. But today, if you listened to this and recognized yourself in the biology, the cortisol, the ADHD traits, I want you to celebrate that realization. You just cracked the code on something you've been blaming yourself for years on.

That's a massive accomplishment. You do not have to earn your right to rest by completing your to-do list perfectly. You do not have to carry the weight of the entire world alone inside your head. Tonight, if your mind starts racing, don't meet it with [00:19:00] hatred or frustration. Meet it with curiosity. Remind that sweet, protective brain that the watch is over, it's time to go to bed, and that it's finally safe to step down.

Until next time, please take care of yourself the way that you're taking care of everyone else. You have earned that peace. As always, it is an honor to be here with you week after week sharing this time together, and I will see you next time