Why So Many High-Functioning Women Feel Tired in Their 40s
Chrissy Sundt · Rest & Illumination ·

High-functioning women in their forties often feel tired not because they are failing, but because physiology is changing while life load stays high. Declining recovery capacity, disrupted sleep and shifting hormones ask for support: smarter training, more rest and less reliance on sheer discipline. Exhaustion here is information, not weakness.
There is a version of midlife womanhood that rarely gets spoken about honestly enough.
She is capable, intelligent, organised and outwardly thriving. She runs a business. She looks after her family. She trains regularly. She manages a full life with moving parts most people never even see. She is the one others assume has it all together.
And yet, privately, she has started asking different questions:
Why am I so tired?
Why does everything feel heavier than it used to?
Why does my libido feel distant? And has my husband/partner noticed?
Why do I need more effort for things that once felt easy?
Why am I coping… but not quite thriving? Where is the joy?
This woman is often told she is stressed, overcommitted, ageing, or simply needs to “look after herself better.”
Sometimes those things are true, but sometimes the real story is this: she is in perimenopause but the symptoms don’t always present themselves in the way we expect.
Many of us were taught to think menopause begins with missed periods, hot flushes and night sweats. We were given a very narrow picture of what hormonal change is supposed to look like.
For many women, especially high-functioning women, the first signs are quieter and easier to dismiss.
It can look like waking up tired even after a decent night’s sleep. It can feel like a lower tolerance for noise, demands and constant decision-making. It can be needing more recovery from exercise than before. It can be feeling physically fit but mentally flatter. It can show up as a nervous system that feels less buffered. It can also mean low libido, not because love has disappeared, but because energy has.
Often, your periods are still regular. That’s why so many women miss it. They assume that because their cycle still arrives, hormones cannot be part of the conversation.
When life is full, hormonal shifts feel louder and I think this is especially true for women carrying a lot.
Women building businesses. Women parenting. Women managing households, finances, relationships, travel, ageing parents, teams, calendars, logistics, investments and emotional labour. Women who are deeply competent and used to handling complexity.
I am to some extent, this woman and at thirty-eight, the same load felt challenging but manageable. At forty-eight, it suddenly feels different.
Not because I have become weaker. Not because I am failing and not because I have lost my edge. It’s because my physiology has changed.
Perimenopause is not simply a neat, linear drop in hormones. It is often a period of fluctuation. Oestrogen can rise and fall unpredictably. Progesterone can become less reliable. Testosterone may decline quietly in the background. Those shifts can affect mood, stress tolerance, motivation, recovery, libido and capacity.
Your life may not have changed dramatically but your internal resources have and it’s important at this stage to say that it is not about doing less. It is about doing things differently.
For years, many high-performing women I know and train have been rewarded for pushing through. We override tiredness. We optimise. We become efficient. We become excellent at carrying things.
But midlife often asks for a different skillset that has to be learned:
Not more discipline.
Not more self-criticism.
Not another attempt to force yourself back into an old operating system.
It asks for support.
I am having to make myself seek out smarter recovery tools. I am actively trying to set better boundaries (not easy when you are a people pleaser!). I am trying to have more honest conversations about what I can actually manage and where I need help.
When I train I want to do sessions that build rather than deplete me and my nutrition has to match my output. In practical terms that means a lot more protein and fibre than I thought!
I am also trying to create space for pleasure and for doing things that take me out of the everyday and out of my comfort zone.
And whilst I think we all need the right medical support when that feels appropriate, we also need stop interpreting every symptom as a personal failure or something to hide.
What has helped me rethink this season
The biggest shift has been understanding that energy is not just about sleep or willpower. Capacity is influenced by physiology, mental load, environment and the season of life you are in.
Sometimes what looks like laziness is depletion.
Sometimes what looks like low motivation is hormonal change.
Sometimes what looks like “not coping well enough” is simply too much on one nervous system.
That realisation is not limiting. It is liberating. Because once you understand the real problem, you stop solving the wrong one.
What support can look like
For some women, support looks like strength training and eating enough protein. For others, it means reducing hidden stress and delegating more. For some, it means addressing sleep or nervous system regulation. For others, it means exploring HRT and other medical support with a knowledgeable practitioner.
There is no one-size-fits-all answer.
But there is a common thread: women need frameworks for this stage of life that are practical, intelligent and rooted in reality.
We need approaches that honour ambition rather than assume we should become smaller and quieter with age.
If this resonates with you, if you are functioning but not feeling like yourself…
If life looks good on paper but heavier in your body…
If you keep wondering why your spark feels harder to access…
Please know this: you are not broken. You are not behind.
You are not failing at life. Your operating system may simply be changing.
With the right support, this chapter can become one of the strongest, wisest and most powerful seasons of your life.
Why am I writing about this now? Because too many women are privately struggling while publicly succeeding. I think we deserve better language than its “just stress” and I don’t think we should have to figure this out alone.
I also truly believe that midlife vitality is not a myth reserved for the lucky few. It is something we can build — intelligently, compassionately and together.
Ps. If you want to explore a different way to move mindfully in midlife come and try my new 4-week Awaken Barre programme: mindful movement designed for intelligent transformation.
First published in The Midlife Movement, Chrissy’s newsletter.
Common questions
Why do high-functioning women feel tired in their 40s?
Chrissy points to perimenopause, a stage where hormones like oestrogen, progesterone and testosterone fluctuate rather than drop in a straight line. For women already carrying heavy loads at work and home, those shifts can hit harder, showing up as fatigue, low motivation and less patience, even though nothing outward has changed.
Can you be in perimenopause with regular periods?
Yes. Many women assume that because their cycle still arrives on schedule, hormones cannot be behind how they feel. Chrissy notes that periods often stay regular well into perimenopause, which is exactly why the connection gets missed and symptoms get blamed on stress or ageing instead.
What are subtle signs of perimenopause in high achievers?
Subtle signs include waking up tired after a full night's sleep, needing longer to recover from exercise, feeling physically fit but mentally flat, a shorter fuse for noise and decisions, and a nervous system that feels less able to absorb daily demands.
Does low libido in your 40s mean something is wrong?
Not necessarily. Chrissy describes a drop in libido as something that can come from lower energy and hormonal fluctuation rather than a loss of love or attraction. She frames it as a physical shift worth understanding, not a sign that a relationship or desire has failed.
What kind of support helps women in this stage of life?
There is no single fix. For some women it looks like strength training and eating enough protein, for others it means reducing hidden stress and delegating more, addressing sleep or nervous system regulation, or exploring HRT with a knowledgeable practitioner.