How Oestrogen Affects Sleep: Understanding the Hormonal Changes Behind Restless Nights
If you've started to struggle to drift off, are waking more often during the night or feeling as though you've barely slept, despite spending eight hours in bed, you may be wondering what's changed.
For many women going through perimenopause sleep patterns begins to change long before other signs may occur. In fact, disrupted sleep can be one of the earliest signs of perimenopause, often appearing before hot flushes become noticeable or menstrual cycles become irregular.
While there are many factors that influence how well we sleep, one hormone plays a particularly important role: oestrogen.
Understanding how oestrogen affects sleep won't solve every restless night, but it can help explain why your body may feel different during midlife and why sleep isn't always as straightforward as it once was.
What does oestrogen do?
Oestrogen is often thought of as a reproductive hormone, but its role extends far beyond fertility and menstrual cycles. It influences many of the systems that help us feel healthy and well every day, including:
- Body temperature regulation
- Mood and emotional wellbeing
- Brain function
- Blood vessels
- Bone health
- Sleep quality
During perimenopause, oestrogen levels don't simply decline in a straight line. Instead, they fluctuate, sometimes quite dramatically, before gradually reducing over time. These fluctuations can have a ripple effect throughout the body, including affecting the way we sleep.
How changing oestrogen levels affect sleep
Sleep is a surprisingly complex process.
Throughout the night, our bodies move through different stages of sleep, each with an important role in physical restoration, memory and emotional wellbeing.
Oestrogen helps support several of the systems involved in maintaining healthy sleep. As levels fluctuate during perimenopause, many women notice changes such as:
- Waking more frequently during the night
- Lighter, less refreshing sleep
- Difficulty getting back to sleep
- Feeling tired despite spending enough time in bed
While every woman's experience is different, these changes are common and can occur alongside other symptoms such as anxiety, brain fog and night sweats.
Why does oestrogen affect body temperature?
One of the biggest reasons sleep changes during menopause is because of the way oestrogen influences the brain's temperature regulation system.
A small area of the brain called the hypothalamus acts as the body's thermostat.
As oestrogen levels fluctuate, the hypothalamus becomes more sensitive, narrowing what's known as the thermoneutral zone. This means even a very small rise in body temperature can trigger your body's cooling response.
The result may be:
- Hot flushes
- Night sweats
- Waking suddenly feeling overheated
These symptoms often interrupt deep sleep, making it harder to wake feeling refreshed.
Doctor's Insight
"Oestrogen is probably the biggest player because it influences temperature regulation, serotonin pathways, mood, blood vessels and sleep quality."
Oestrogen isn't working alone
Although oestrogen plays a significant role, it isn't the only hormone influencing sleep.
Progesterone also begins to decline during perimenopause and has naturally calming effects on the brain. Melatonin, the hormone involved in regulating our sleep-wake cycle, naturally decreases with age. Stress hormones such as cortisol can also become more noticeable during midlife, particularly when poor sleep and busy lives combine.
Progesterone also begins to decline during perimenopause and has naturally calming effects on the brain. Melatonin, the hormone involved in regulating our sleep-wake cycle, naturally decreases with age. Stress hormones such as cortisol can also become more noticeable during midlife, particularly when poor sleep and busy lives combine.
It's not just about hot flushes
Many people assume menopause-related sleep problems are caused entirely by night sweats. In reality, the science is much more complex.
According to Dr Nikki Ramskill, changing oestrogen levels also influence neurotransmitters such as serotonin and GABA (gamma-aminobutyric acid), chemicals that help regulate mood, relaxation and sleep. This helps explain why symptoms like poor sleep, anxiety and brain fog often occur together rather than in isolation.
Doctor's Insight
"Oestrogen is probably the biggest player because it influences temperature regulation, serotonin pathways, mood, blood vessels and sleep quality."
Dr Nikki Ramskill
Women's Health GP & Menopause Specialist
Why does sleep often become lighter?
If you find yourself waking several times a night for no obvious reason, you're not imagining it.
Hormonal changes can alter what's known as sleep architecture, the different stages of sleep we move through each night. Rather than spending longer in deep, restorative sleep, many women experience lighter, more fragmented sleep, making them more likely to wake because of:
- A hot flush
- A change in temperature
- Needing the toilet
- A small noise
- Anxious thoughts
This are just some of the reasons why many women say they don't struggle to fall asleep, but struggle to stay asleep.
Supporting better sleep during menopause
While hormonal changes can't always be prevented, there are practical ways to help support healthier sleep habits.
Create a calming evening routine
Limit alcohol later in the evening
Stay active
Keep a consistent sleep routine
Going to bed and waking up at similar times each day helps reinforce your body's natural sleep-wake cycle, known as your circadian rhythm.
Create a calming evening routine
Gentle habits such as reading, stretching or limiting screen time before bed can help your mind begin to unwind.
Limit alcohol later in the evening
Alcohol may make you feel sleepy initially, but it can reduce sleep quality and contribute to more fragmented sleep.
Stay active
Regular movement during the day has been shown to support better sleep quality, although exercising immediately before bed may not suit everyone.
Speak to a healthcare professional
If disrupted sleep is affecting your daily life, it's important not to simply accept it as part of getting older.
There are many reasons why sleep changes during midlife, and discussing your symptoms with a healthcare professional can help identify the most appropriate support for you.
Frequently asked questions
Can low oestrogen cause poor sleep?
Changing oestrogen levels are one of several factors that can influence sleep during perimenopause and menopause. They can affect temperature regulation, mood and the quality of sleep, although other hormones and lifestyle factors also play a role.
Why do I wake up feeling too hot?
Fluctuating oestrogen levels can make the brain's temperature regulation system more sensitive, meaning even small changes in body temperature may trigger a hot flush or night sweat.
Is poor sleep always caused by menopause?
No. Sleep problems can have many different causes. If your symptoms are persistent or affecting your quality of life, it's important to discuss them with a healthcare professional.
Can improving sleep help other menopause symptoms?
According to Dr Nikki Ramskill, sleep is one of the foundations of good health. Better sleep can have a positive impact on mood, concentration, emotional wellbeing and overall quality of life.
