Night sweats in perimenopause: why they happen, how to get relief, and when it's not menopause

You wake up drenched, kick off the covers, change your shirt, then lie there freezing. Two hours later it happens again. Night sweats don't just ruin sheets; they wreck sleep, mood and patience. Here's what's going on, what actually helps, and the signs that something other than menopause might be the cause.

Why perimenopause causes night sweats

Night sweats are simply hot flashes that happen at night. The National Institute on Aging explains that as the ovaries become less active, estrogen and progesterone levels fall, and that shift is believed to trigger hot flashes. Newer research points to a group of brain cells involved in temperature control: the two newest nonhormone medicines, fezolinetant (Veozah) and elinzanetant (Lynkuet), work by blocking signals to those cells.

How long do they last?

Longer than most of us were told. In the large SWAN study, women with frequent hot flashes or night sweats had them for a median of 7.4 years in total, and for a median of 4.5 years after their final period. Duration varied by background: African American women had the longest median duration at about 10 years. Women whose symptoms started early, before menopause or in early perimenopause, tended to have them the longest. So if yours started early, it's a good reason to treat them rather than wait.

What helps

Comfort measures

The NIA suggests keeping the bedroom cool, using a fan, sipping cold water before bed, dressing in layers you can shed, limiting alcohol, spicy foods and caffeine, not smoking, and keeping a healthy weight. These are sensible and low risk. Be realistic, though: The Menopause Society's 2023 review found the evidence that cooling techniques and trigger avoidance actually reduce hot flashes is weak or insufficient. Think of them as making nights more bearable, not as a cure.

Treatments that are proven to work

On hormone therapy, the landscape shifted in November 2025, when the FDA began removing the broad boxed warnings about heart disease, breast cancer and dementia from hormone therapy labels. The FDA's labeled recommendation is to start systemic hormone therapy within 10 years of menopause or before age 60, and the decision about timing and duration is between you and your prescriber. Two details worth knowing: women who still have a uterus take a progestogen along with estrogen to protect the uterine lining, and the FDA kept the boxed warning about endometrial cancer on systemic estrogen-alone products. Your clinician will match the type and form of hormone therapy to your body and your history. We break this down in what changed with HRT labels. If hormones aren't for you, see hot flash relief without hormones and our comparison of Veozah vs Lynkuet.

What doesn't have good evidence

The Menopause Society does not recommend paced breathing or relaxation techniques for hot flashes, and found evidence lacking for supplements and herbal remedies. The NIA also notes that black cohosh, soy isoflavones and DHEA haven't been proven to work, and some carry risks.

When night sweats are not menopause

This is the part we really want you to read. Night sweats in your 40s and 50s are often hormonal, but not always. The NHS and Mayo Clinic list many other causes:

• Medicines, including some antidepressants, steroids, painkillers and diabetes drugs that lower blood sugar
• Low blood sugar
• Overactive thyroid
• Anxiety
• Alcohol or drug use
• Obstructive sleep apnea
• Infections, including tuberculosis and HIV
• Lymphoma and leukemia
• Hyperhidrosis, a harmless condition that causes excess sweating

Sometimes no cause is found, and the NHS notes that sweating at night is normal if your room or bedding is simply too warm. If your night sweats arrive alongside daytime hot flashes and changing periods, perimenopause is a likely suspect, but tell your clinician about everything, including any of the symptoms below.

When to call your clinician

• Night sweats with unexplained weight loss.
• Night sweats with fever, chills or shivering, a cough or diarrhea.
• Night sweats that start months or years after your other menopause symptoms ended.
• Regular night sweats that wake you or worry you.
• Night sweats that began after starting a new medicine. Don't stop it on your own; ask whether there's an alternative.

Questions to ask your clinician

1. Do my night sweats fit perimenopause, or should we check for other causes like thyroid or infection?
2. Could any of my medicines be causing them?
3. Am I a good candidate for hormone therapy, given my age, timing and history?
4. If not, which nonhormone option fits me: an SSRI or SNRI, gabapentin, fezolinetant or elinzanetant?
5. Would CBT or clinical hypnosis be worth trying, and can you refer me?
6. Should I be screened for sleep apnea?

A week or two of notes on how often you wake, how soaked you are and anything else unusual helps a lot. Bring those notes, plus your medication list, to your appointment.

Questions

Why do I get night sweats in perimenopause?

Night sweats are hot flashes that happen during sleep. The National Institute on Aging explains that falling estrogen and progesterone as the ovaries slow down are believed to trigger them.

How long do menopause night sweats last?

In the SWAN study, women with frequent hot flashes and night sweats had them for a median of 7.4 years, including a median of 4.5 years after their final period. Starting early in perimenopause was linked to lasting longer.

What is the most effective treatment for night sweats?

The Menopause Society calls hormone therapy the first-line treatment for healthy women at or around menopause. Proven nonhormone options include CBT, clinical hypnosis, SSRIs and SNRIs, gabapentin, fezolinetant and elinzanetant.

When should I worry about night sweats?

See a clinician if night sweats come with fever, unexplained weight loss, a cough, or start long after your other menopause symptoms ended. Infections, thyroid problems, medicines, sleep apnea and some cancers can cause night sweats.

Does keeping the bedroom cool stop night sweats?

It can make nights more comfortable, but The Menopause Society found that the evidence for cooling techniques actually reducing hot flashes is weak. If night sweats are disrupting your sleep, ask about proven treatments.

Keep reading

• Early signs of perimenopause: can it really start in your 30s?
• How long does perimenopause last, and how long do the symptoms stick around?
• Perimenopause blood test: can FSH or any lab really tell you where you are?
• Menopause and your bones: osteoporosis risk, bone density scans and what protects you
• Do menopause supplements work? An honest look at black cohosh, soy and the rest
• Perimenopause symptoms: the full list and red flags

Education and personal experience, not medical advice. Talk with your own clinician before making health decisions.