Straight answers

Exhausted at 45: why sleeping doesn't fix it

This isn't the tiredness of a short night. It's waking up wrecked after a full eight hours. It's needing a nap to get through to the evening. It's not recognising the woman who, two years ago, managed everything. If that sounds familiar, it has a name and an explanation — and it isn't "just your age".

The tiredness that sleep doesn't touch

There's a difference between being tired and being depleted. Ordinary tiredness lifts when you rest. This doesn't. You sleep, and in the morning your body is just as heavy. That's the clue that it isn't about hours — it's about something else.

You're not exaggerating, and you're not alone. The medical journal Menopause published a 2021 international survey of women with hot flushes and night sweats, and "feeling tired or worn out" came out as one of the most commonly reported symptoms — around 74% of them in Europe and the US, and 75% in Japan. Roughly three in four. One caveat: everyone in that study already had hot flushes, so the number can't be stretched to cover all women this age. But it tells you something plainly enough — if you have symptoms, fatigue usually comes with them.

And still almost nobody talks about it. Hot flushes get the airtime, while exhaustion — the symptom that upends daily life for so many women — stays out of the conversation.

Why perimenopause wipes you out

There isn't one cause. There are several at once, and that's half the problem: on its own each looks minor, but stacked up they flatten you.

• Sleep changes in quality, not just quantity. According to the SWAN study, sleep quality starts to deteriorate in perimenopause specifically. There are more micro-awakenings and less deep sleep — the kind that actually restores. You can spend eight hours in bed and rest as though it were five.
• Waking in the small hours. Between 37% in the SWAN study and two thirds of women in the Spanish DOMMA study report disturbed sleep. Often it's night sweats so mild you don't register them as such — you just notice you're awake.
• Heavier periods. In perimenopause, bleeding commonly gets heavier. Over months, that can lead to iron-deficiency anaemia, which produces exactly this: deep fatigue, breathlessness on stairs, pallor. Very common, and very treatable.
• Mood and anxiety. Running on alert all day burns through an enormous amount of energy. And anxiety and insomnia feed each other: you sleep badly because you're wired, and you're wired because you slept badly.

What if it isn't hormones?

This part matters, and it's the part you almost never get told honestly. Extreme fatigue is a very non-specific symptom: it fits perimenopause, but it also fits several other things worth ruling out first.

• Hypothyroidism. An underactive thyroid is more common in women, and more likely as you get older. Its symptoms — fatigue, weight gain, feeling the cold, low mood, brittle hair — overlap almost completely with perimenopause, so it's one of the first things worth ruling out.
• Anaemia or low iron. Especially if your periods are heavy.
• Sleep apnoea. Under-diagnosed in women, and more common after menopause. Suspect it if you snore, wake with headaches, or your partner notices you stop breathing.
• Depression. Shares many symptoms with this stage and deserves treatment in its own right. Being exhausted isn't the same as having no desire for anything.
• Vitamin D or B12 deficiency, diabetes, medication side effects. All can cause fatigue, and all are easy to check.

You need a doctor to rule these out. Asking for a check-up isn't doubting the hormones — it's doing this in the right order.

What actually helps

Start by ruling out anything else.

From there, five things worth trying.

1. Protect your sleep

This is one of the biggest levers you have — and what counts isn't more hours, but better ones:

• Get up at the same time every day, even after a terrible night. Your body clock is anchored more by when you get up than when you go to bed.
• Make the most of your first hour up — go for a walk if you can. Ten to thirty minutes of daylight is enough: it's the strongest signal your body has for resetting its circadian rhythm.
• A cool bedroom. Sleeping too warm breaks your sleep up, and the ideal bedroom temperature usually sits between 16 and 19°C.
• Alcohol breaks up your sleep — keep it to a minimum. It helps you drop off, then wrecks the second half of the night, exactly when you're already prone to waking.
• Keep caffeine to the morning. Early coffee is rarely the problem; chaining it through the afternoon to keep going is. That's how the cycle starts — bad night, more coffee, worse night.

And if insomnia has properly set in, talk to your doctor, because there are therapies such as cognitive behavioural therapy that can help. It has the best evidence at this stage: a meta-analysis of 11 randomised trials in 973 women found improvements in sleep quality that held up to six months later.

2. Move — but not necessarily harder

Plenty of women train themselves into the ground, and it isn't the answer. If you're already flat, going hard every day tends to make the fatigue worse — recovery starts to matter as much as effort.

• The WHO recommends 150 to 300 minutes of moderate activity a week — brisk walking, cycling, swimming — plus strength work on at least two days.
• Strength training (weights, resistance bands, or bodyweight moves like squats) has the most direct evidence on sleep: in a trial of 56 women aged 50 to 65 it improved insomnia and sleep quality compared with a control group. And it holds on to muscle, which you start losing right about now.

3. Eat to hold your energy steady

• Protein at every meal, not just dinner. It helps preserve muscle and keeps blood sugar steadier through the afternoon.
• A Mediterranean diet. Vegetables, pulses, olive oil, fish, nuts, wholegrains. It's the diet with the most evidence behind it for cardiovascular health and inflammation — and you don't have to follow it to the letter to feel the difference.

4. Handle stress a different way

Sustained stress is physically draining, and it lands harder at this stage. Mindfulness and yoga both help with sleep and mood — which is exactly where the fatigue is biting.

5. If hot flushes are wrecking your nights

When the real problem is waking up drenched three times a night, treating that often fixes the fatigue too. There are effective treatments set out in the clinical guidelines — NICE NG23 among them — both hormonal and non-hormonal. Which one fits you is a conversation to have with a professional who knows this stage well.

Keep reading: the full guide to perimenopause — what it is, when it starts and every symptom — or why you keep losing your words.

Maia isn't a medical service and doesn't replace your healthcare professional. This article is informational and isn't a diagnostic tool — persistent fatigue should be checked by your doctor.

Sources: on how common fatigue is, "Global cross-sectional survey of women with vasomotor symptoms", Menopause (2021); on sleep, SWAN, "Effects of Sleep Problems During Menopause" and "Sleep Disturbance and Perimenopause: A Narrative Review" (2025); on gynaecological causes of fatigue and anaemia, Banner Health; on global symptom prevalence, "Mapping global prevalence of menopausal symptoms", BMC Public Health (2024); NHS, "Menopause and perimenopause"; NICE, guideline NG23 (2024 update); and the DOMMA study, "Radiografía de la Menopausia en España"; on CBT for insomnia, meta-analysis of 11 trials in women with menopausal insomnia (2025); on physical activity, WHO, "Guidelines on Physical Activity and Sedentary Behaviour" (2020); and on strength training and sleep, randomised trial in postmenopausal women (2023).