Mid-meeting. You know this material, you wrote the material, and mid-sentence the word just leaves. A little gap opens where "quarterly" used to be, your face goes warm, your brain scrabbles at an empty shelf. You laugh it off and get through it, and by 3pm you've read the same email four times without absorbing a syllable.
Two things. You're not failing at your job. And there's actual data on this, which says the problem is real, measurable, and way more common than anyone admits over the office kettle.
The data: a real productivity problem
US research from The Menopause Society's 2025 Annual Meeting surveyed 945 employed American women aged 35 to 59. Women with perimenopausal symptoms reported an average 22.5 per cent work impairment, versus 12.7 per cent premenopausal and 16.9 per cent postmenopausal. The perimenopause years took the biggest hit.
Severity matters too. Mild symptoms averaged around 10 per cent impairment, manageable. Severe symptoms averaged over 33 per cent. A third of your working capacity, effectively gone, and it lines up with Jean Hailes: about 1 in 4 women get severe symptoms affecting daily life, more than half say their mental and emotional wellbeing's been hit.
The dollar figure: an estimated US$6,000 in lost productivity per year per affected woman, roughly US$49 billion across the US workforce. American figures, take as indicative, but the pattern almost certainly travels: symptoms peaking right when career, kids and ageing parents are all peaking together. Over 80 per cent of women report symptoms during perimenopause. This isn't a fringe problem.
What actually impairs your work
Researchers dug into which symptoms predicted work impairment most strongly, and it wasn't brain fog on its own (if that's your main issue, there's a whole post on it). It was the physical stuff: sleep discomfort and pain, followed by anxiety and irritability. If you've been blaming your foggy brain alone, notice what's feeding it: the 3am wake-up, the aching shoulders, the buzzing anxiety making deep focus impossible. Treat the body, and the brain often follows.
Slightly liberating reframe: you don't have a focus problem to power through with hustle. You've got a symptom cluster, mostly sleep and pain, quietly taxing your day. Symptoms are treatable. Willpower against untreated symptoms is just exhaustion with better branding.
Strategy 1: treat the symptoms first, the highest-leverage move
The most powerful work strategy isn't a work strategy at all, it's treatment. CBT-I for sleep, works as well as medication short-term with fewer side effects, full breakdown in Waking at 3am. Treat the flushes and night sweats fragmenting your sleep, more on the options (including MHT) in HRT in Australia. Treat the mood or anxiety if that's the bigger driver, subsidised psychology available via your GP. Don't accept two years of impaired work as a personality change. These are medical symptoms, not character flaws.
Strategy 2: map your energy, defend your clear windows
Rate your energy 0 to 10 at three or four points a day for a fortnight, note when you're sharpest and when fog rolls in. Most women find a pattern, often morning clarity, afternoon fog, but guessing's worse than measuring. Once you see the windows, defend them. Hardest, highest-focus work goes in your clearest slot. Email and routine tasks go in the foggy hours where they don't need much of you.
Strategy 3: batch tasks, single-task deliberately
Brain fog punishes task-switching. Every jump from spreadsheet to email to message back to spreadsheet costs you a re-orientation toll, and in perimenopause that toll's higher and the coins are fewer. Batch calls together, batch emails into two or three sittings instead of forty interruptions. Deep work means inbox closed, phone in a drawer. Single-tasking feels old-fashioned in a juggling-obsessed world, it's also the most fog-friendly way to work.
Strategy 4: meeting hygiene
Go in with brief prep notes: three key points, your questions, written down first. If the words vanish mid-sentence, they're already on the page. Capture takeaways in writing straight after, not "later," which means never in perimenopause. External memory isn't weakness, it's a system, and it makes you look extremely on top of things.
Strategy 5: build real recovery in
Flat energy from 9 to 5 setting you up for a downward slide? Build in short recovery breaks, a walk, five minutes of air, a proper lunch away from the screen, instead of pushing through on caffeine and grinding into the evening. Movement eases the physical symptoms that actually predict work impairment, and nudges sleep in the right direction. Watch your afternoon coffee too, it quietly taxes tonight's sleep, which taxes tomorrow, which sends you back to the machine.
Should you tell your workplace?
Women are often hesitant to disclose, fearing they'll be seen differently, and that fear's understandable given ageism and sexism are real. You get to weigh that risk yourself. But you don't owe anyone your diagnosis. You can have a needs-based conversation without a health disclosure: "I'm managing a health issue affecting my sleep, getting it treated, and in the meantime shifting deep-focus work to mornings." True, sufficient, nobody's business beyond that. Australian workplace protections around discrimination exist, and many workplaces have HR or EAP support, worth a quiet look before you need it.
This is a medical issue, not a work-ethic issue
Write that on a sticky note. The women in that survey weren't less committed or less capable, they were symptomatic. Over 80 per cent have symptoms during perimenopause, taxing performance exactly when careers peak. If brain fog, exhaustion or 3pm crashes are eating your working day, the most professional move isn't hiding it better, it's getting it treated.
Your action plan this week
- Track energy 0–10 at four points a day for two weeks, find your focus windows
- Book deep work into them, move routine tasks to the foggy hours
- Adopt meeting hygiene: prep notes before, written takeaways after
- Book a GP appointment to treat the driving symptoms, sleep, flushes, mood
- Decide your disclosure stance: check your workplace's policies, plan a needs-based conversation if you want one
The Hormone Survival Planner has the energy-mapping and low-battery-day planning built in, made for exactly this kind of brain.