Does Menopause Affect Sleep?
While trying to understand why so many women begin struggling with sleep during perimenopause and after menopause, I came across a scientific review titled Sleep Disturbances in Menopause: Neuroendocrine Mechanisms and Clinical Implications.
The paper brings together research on hormones, brain chemistry, body-temperature control, breathing, metabolism and circadian rhythm. Its central message is that menopausal sleep disturbance is rarely caused by one thing.
An estimated 40–60% of women experience sleep difficulties during the menopausal transition and postmenopause. These can include trouble falling asleep, repeated waking, early-morning waking or sleeping without feeling properly restored. Although night sweats are an obvious cause, the research shows that the changes extend much further into the systems responsible for creating and maintaining sleep.
Sleep is something the brain actively produces
Sleep does not happen simply because we are tired. It is an active neurological process controlled by networks of specialised brain cells.
One important sleep-promoting area is the ventrolateral preoptic nucleus, or VLPO, within the hypothalamus. The hypothalamus is a small region of the brain involved in hormone control, temperature regulation, appetite and the sleep–wake cycle.
When it is time to sleep, cells within the VLPO release gamma-aminobutyric acid, better known as GABA. GABA is an inhibitory neurotransmitter: a chemical messenger that reduces activity between nerve cells.
Its role is to quieten the brain systems responsible for maintaining wakefulness. These systems use chemicals including norepinephrine, serotonin, histamine and orexin to keep us alert and responsive during the day. For stable sleep to begin, this wake-promoting activity must be suppressed sufficiently for sleep-promoting networks to take control.
The brain can then move through the different stages of non-rapid eye movement sleep, including deep slow-wave sleep, and rapid eye movement, or REM, sleep.
What do hormones have to do with GABA?
Oestrogen and progesterone are not confined to the reproductive system. Both influence the brain pathways involved in sleep.
Oestrogen receptors are present in areas that control alertness, circadian timing and body temperature. Oestrogen also interacts with several neurotransmitter systems, including serotonin, acetylcholine and GABA. Fluctuating and declining oestrogen can therefore affect the stability of the wider sleep–wake system.
Progesterone has a particularly interesting connection with GABA. The brain converts progesterone into neuroactive substances, including allopregnanolone. Allopregnanolone attaches to GABA-A receptors and strengthens GABA’s inhibitory effect. This produces calming, anti-anxiety and sleep-promoting activity.
As ovulation becomes less reliable during perimenopause, progesterone production begins to fall. After menopause, ovarian progesterone production becomes extremely low. This means the brain loses some of the hormonal support that previously helped GABA quieten wake-promoting activity.
It would be too simplistic to say that menopause causes a straightforward “GABA deficiency.” GABA does not simply disappear. Rather, changes in progesterone, allopregnanolone and oestrogen may alter the way the brain’s inhibitory system functions.
This may help explain the familiar experience of feeling exhausted while the brain remains alert, busy or unable to switch off.
Why sleep becomes lighter
Objective sleep studies suggest that sleep often becomes lighter and more fragmented across the menopausal transition.
Women may spend more time awake after first falling asleep, experience more brief arousals and have reduced sleep efficiency—the proportion of time in bed actually spent asleep. Deep and REM sleep do not necessarily disappear, but their organisation and continuity may become less stable.
Researchers have also recorded increased beta brainwave activity during non-REM sleep. Beta activity is normally associated with alertness and mental processing. Finding more of it during sleep suggests that the brain may remain in a state of physiological hyperarousal.
A woman can therefore technically be asleep while her brain is not settling as deeply or consistently as it once did. This may contribute to easily disturbed, unrefreshing sleep and the feeling of never having switched off completely.
Night sweats can repeatedly pull the brain awake
Falling oestrogen affects temperature regulation within the hypothalamus. The range of temperatures the brain considers comfortable becomes narrower, so a relatively small change can trigger a hot flush.
Blood vessels widen, heat spreads through the body and sweating begins. At the same time, the sympathetic nervous system—the system responsible for alertness and action—is activated.
A night sweat can pull the brain out of deeper sleep. Once awake, discomfort, anxiety or racing thoughts may make returning to sleep difficult.
If this happens repeatedly, the brain may begin to associate bedtime with wakefulness and vigilance. Worrying about whether sleep will come, checking the time and spending longer in bed trying to compensate can unintentionally help turn hormonally triggered disruption into chronic insomnia.
The body clock changes too
Menopause may also weaken the circadian signals that organise sleep across each 24-hour period.
The review describes research in which postmenopausal women showed an advance in circadian timing of approximately one hour, as well as weaker and less stable daily rhythms. This may contribute to becoming sleepy earlier and waking before the desired time.
Melatonin production can also become lower and its nightly release shorter. Melatonin is not simply a sedative. It acts as a biological signal telling the brain that night has begun. When that signal becomes weaker, sleep timing and continuity may become less reliable.
Inconsistent bedtimes, reduced daylight exposure, daytime sleeping and low daytime activity can weaken circadian organisation further.
Not every menopausal sleep problem is insomnia
One of the most important points in the review is that disrupted sleep should not automatically be blamed on hormones or anxiety.
Obstructive sleep apnoea becomes more common after menopause. Oestrogen and progesterone help support respiratory drive, upper-airway muscle function and body-fat distribution. Their loss, combined with age-related changes and increased central body fat, can make the airway more vulnerable to narrowing during sleep.
Women with sleep apnoea may report insomnia, fatigue, morning headaches, brain fog, low mood or unrefreshing sleep rather than obvious daytime sleepiness. Snoring, gasping or witnessed pauses in breathing should therefore be investigated.
Restless legs syndrome and periodic limb movements can also fragment sleep. Restless legs syndrome causes uncomfortable leg sensations and an urge to move, particularly during rest in the evening. It is linked to dopamine function and iron availability, which is why ferritin and other measures of iron status may need to be checked.
Finding the right treatment begins with finding the cause
The paper does not present one universal solution because there is no single form of “menopausal sleep.”
Cognitive behavioural therapy for insomnia, or CBT-I, is recommended as the first-line treatment for chronic insomnia. HRT may improve sleep when hot flushes and night sweats are major contributors, although it is not recommended solely as an insomnia treatment. Sleep apnoea, restless legs syndrome and circadian disruption each require their own assessment and management.
Hormonal changes may start the disturbance, but brain arousal, temperature regulation, breathing, metabolism, mood and circadian timing can all become involved.
Poor sleep during menopause is not imagined, nor is it an inevitable inconvenience women must simply tolerate. Understanding what is repeatedly pulling the brain away from sleep is the first step towards finding support that addresses the real problem.
Reference
Tamanna, S., Ullah, M.I., Iftekhar, R. and Shamsuddin, L. (2026) ‘Sleep Disturbances in Menopause: Neuroendocrine Mechanisms and Clinical Implications’, Physiologia, 6(2), article 22. Available at: https://doi.org/10.3390/physiologia6020022