Feeling tired all the time is common in perimenopause. Most often it comes from broken sleep: night sweats, early waking and a busy head at night. But tiredness can also have other causes, like low iron from heavy periods, so it's worth checking if it doesn't lift.
In short
- EMAS links disturbed sleep in menopause to fatigue, irritability and poor concentration.
- Heavy periods can lead to iron deficiency, which also makes you tired.
- If you've been tired for a few weeks without a clear reason, see your doctor. A simple blood test can rule out common causes.
Can perimenopause make you tired?
Yes, mostly through sleep. The European Menopause and Andropause Society (EMAS) explains that night sweats are a main cause of disturbed sleep, and that chronically disturbed sleep can lead to insomnia, fatigue, irritability and trouble with memory and concentration. The Sleep Foundation notes that many people feel more sleepy or tired during the day around menopause, without actually sleeping more.
Why does it happen?
Waking hot and damp several times a night breaks up deep sleep. See night sweats.
Many women wake at 3 or 4 am and can't get back to sleep. See why you wake at 3am.
Losing more blood can lower your iron. Germany's IQWiG lists tiredness and exhaustion among signs of iron deficiency. See heavy periods.
Low mood, anxiety and a full life drain energy and make sleep lighter. See mood swings in perimenopause.
The Sleep Foundation notes that sleep apnoea and restless legs become more common around menopause.
What else can cause tiredness?
Not all tiredness is perimenopause. Common other causes include iron deficiency anaemia, thyroid problems, diabetes, sleep apnoea, depression and some medicines. That's why a doctor may suggest blood tests to check for anaemia, diabetes or thyroid problems. InformedHealth notes that checking hormone levels usually has little practical value for diagnosing menopause.
What helps?
- Regular sleep times. Go to bed and get up at similar times, even after a bad night.
- A cool, dark bedroom. Light layers and a cool room help with night sweats.
- Less caffeine and alcohol late in the day. Both can make sleep lighter.
- Move during the day. Regular activity can improve sleep and energy.
- Ask about insomnia help. The Sleep Foundation calls CBT for insomnia (CBT-I) the first-line treatment. Your doctor can also talk to you about treatment for night sweats.
When to see a doctor
See your doctor if you've been tired for a few weeks and don't know why, if it affects your daily life, or if tiredness comes with weight loss or mood changes. Also go if you have heavy periods, feel short of breath or notice your heartbeat, or if someone notices you snore loudly or stop breathing in your sleep.
Notes on your sleep, night sweats, periods and energy, on paper or in an app like Pausie, help your doctor see what's behind the tiredness.
Frequently asked questions
Is fatigue a sign of perimenopause?
It can be, usually because sleep gets worse. But tiredness has many causes, so lasting fatigue should be checked.
Why am I tired even after 8 hours in bed?
Night sweats and short awakenings can break up sleep without you remembering them. Sleep apnoea is another possible reason.
Can heavy periods make me tired?
Yes. Heavy bleeding can lead to iron deficiency, which causes tiredness. A blood test can show it.
Should I take iron just in case?
No, not without a test. InformedHealth notes that too much iron can be harmful. Ask your doctor first.
Find out what's draining you
Log Exhaustion, Sleep problems, night sweats and your periods in Pausie. After a few weeks you'll see what goes together. No account, and your diary stays on your phone.
This article is general information, not medical advice. Written by the Pausie team. Published and last reviewed 9 November 2026.
Sources
- EMAS Menopause Essentials: Menopausal symptoms
- Sleep Foundation: Menopause and sleep
- InformedHealth.org (IQWiG): Iron deficiency and anemia
- InformedHealth.org (IQWiG): Menopause
- HSE Ireland: Menopause symptoms
- NHS: Tiredness and fatigue