Why perimenopause can leave you exhausted
During perimenopause, oestrogen and progesterone don’t decline smoothly — they fluctuate, sometimes sharply, and many women feel those swings as a deep, dragging tiredness. On top of the hormonal changes themselves, several things tend to stack up at once: night sweats that fragment sleep, insomnia that becomes more common at this stage, and mood changes such as anxiety or low mood, which are draining in their own right. Add the ordinary load of midlife, and it’s no surprise that fatigue is one of the symptoms women mention most.
Sleep is usually the first place to look
Even without drenching night sweats, sleep often becomes lighter and more broken during perimenopause — waking at 3am and lying awake is a story many women recognise. Broken sleep, night after night, is enough on its own to cause daytime exhaustion, poor concentration and irritability. If your nights are disturbed, improving them is usually the fastest route to more energy, whether through sleep habits, treating night sweats, or both.
Self-help worth trying
None of these steps is dramatic on its own, but together they give your sleep and energy the best possible foundation — and they make it much clearer whether something more is going on.
- Keep a consistent wake time, even after a bad night — it anchors your body clock.
- Keep the bedroom cool and dark; light bedding and layers help with night sweats.
- Limit alcohol, and avoid caffeine from mid-afternoon — both fragment sleep.
- Stay active during the day; regular exercise tends to improve both sleep and energy.
- Pace yourself rather than pushing through — short breaks beat a full crash.
Other causes a doctor may check
Fatigue has many possible causes, and perimenopause doesn’t rule the others out. Depending on your history, a GP may check things like thyroid function and iron levels — low iron is worth particular attention if your periods have become heavier — along with other tests guided by your symptoms. Sleep disorders and mood conditions are also part of the picture. That’s not a reason to worry; it’s the reason a proper assessment beats guessing.
When to see a GP
See a doctor if fatigue is persistent, worsening, or affecting your work, safety or relationships — or if it comes with symptoms such as unexplained weight change, breathlessness, or very heavy bleeding. And if tiredness is travelling with hot flushes, disturbed sleep or mood changes, treating the perimenopausal picture as a whole often helps energy too — see perimenopause treatment options, or start with the 2-minute symptom check.
At Lumara, Dr Nirusha Weultjes (FRACGP) sees patients in Wollongong for 45-minute initial consultations, with follow-ups in person or by telehealth. No referral is needed and Medicare rebates apply — see consultation fees, or call (02) 4288 2524.
This page is general health information only. It is not medical advice, and it can’t account for your personal circumstances — please speak with a doctor about what’s right for you.