Evidence explainerSleep & Magnesium
Progesterone for Sleep in Menopause: What the Trials Show, Doses Studied and Side Effects
Micronized progesterone makes some women drowsy, and small trials show less time awake at night. It is not approved as a sleep aid, the trials were tiny, and the main reason it is prescribed is to protect the uterus during estrogen therapy.
Key takeaways
- Oral micronized progesterone (Prometrium) is FDA-approved to prevent endometrial hyperplasia in postmenopausal women with a uterus who take estrogen, and for secondary amenorrhea. It is not approved as a sleep aid [1].
- Its label warns that it may cause transient dizziness and drowsiness and says to take it as a single dose at bedtime [1].
- In two small randomized trials in healthy postmenopausal women (8 and 10 women), 300 mg a day for about 3 weeks (at 11 p.m. in one trial) reduced time spent awake during the night [2][3].
- In a 189-woman perimenopause trial, 300 mg at bedtime did not significantly lower the hot flush and night sweat score, but women on progesterone reported better sleep quality and fewer night sweats [5].
- Capsules contain peanut oil, so the label says people allergic to peanuts should not take them [1].
What progesterone is approved for
The Prometrium label has two indications: preventing thickening of the uterine lining (endometrial hyperplasia) in postmenopausal women with a uterus who take estrogen, and treating secondary amenorrhea. For uterine protection the labeled dose is 200 mg at bedtime for 12 days of each 28-day cycle [1].
That protection matters. In the 3-year PEPI trial, women taking estrogen alone developed simple hyperplasia far more often than women on placebo (27.7% vs 0.8%), while the three estrogen-plus-progestogen regimens, one of them micronized progesterone 200 mg for 12 days a month, had rates similar to placebo [8].
Sleep is not on the label. Any prescription aimed mainly at sleep is off-label, which is why the dose and schedule used in the sleep studies below differ from the labeled ones.
What the sleep trials found
A Belgian trial gave 8 healthy postmenopausal women aged 48 to 74, none with sleep complaints, 300 mg of progesterone or placebo at 11 p.m. for 3 weeks [2]. Progesterone did not change normal, undisturbed sleep. On a night disturbed by blood sampling every 15 minutes, though, time awake after falling asleep was 53% lower and deep (slow-wave) sleep almost 50% higher than on placebo [2].
A German crossover trial in 10 healthy postmenopausal women aged 54 to 70 gave 300 mg micronized progesterone for 21 days. It cut intermittent time awake, increased REM sleep in the first third of the night, and did not affect next-day cognitive tests [3].
In women taking estrogen, the type of progestogen may matter. In a 6-month randomized trial of 21 postmenopausal women on conjugated estrogens, sleep efficiency rose 8% with micronized progesterone 200 mg but not with medroxyprogesterone acetate 5 mg, although both groups reported better sleep on questionnaires [4].
Perimenopause: the largest trial
A Canada-wide, double-blind trial randomized 189 perimenopausal women aged 35 to 58 to 300 mg oral micronized progesterone at bedtime or placebo for 3 months [5]. The primary outcome, a combined hot flush and night sweat score, did not differ significantly between groups, and the authors note the trial was underpowered [5].
Secondary results favored progesterone: women perceived fewer night sweats and better sleep quality, and reported less perimenopause-related interference with daily life, without more depression. No serious adverse events occurred [5].
How it fits with hormone therapy overall
A 2022 meta-analysis of 15 randomized trials found that menopausal hormone therapy improved self-reported sleep slightly (standardized mean difference -0.13) but did not change sleep measured in a sleep lab [6]. Estrogen combined with micronized progesterone improved sleep disturbance (standardized mean difference -0.22), while estrogen alone did not [6].
The 2022 hormone therapy position statement says the risks of hormone therapy depend on type, dose, duration, route, timing of initiation and whether a progestogen is used, and that treatment should be individualized [7]. Our hormone therapy boxed-warning explainer covers the 2025 to 2026 label changes.
Limits and safety
Progesterone needs a prescription. If you are considering it as part of menopause treatment, our comparison of online menopause HRT providers shows who prescribes FDA-approved micronized progesterone.
- Tiny trials: the two sleep-lab trials together enrolled 18 healthy women, none selected for insomnia, so they show an effect on sleep structure, not that progesterone treats insomnia [2][3].
- Drowsiness and dizziness: the label advises caution when driving or operating machinery [1].
- Peanut allergy: the capsules contain peanut oil [1].
- Contraindications on the label include a history of blood clots, stroke or heart attack, liver disease and abnormal genital bleeding of unknown cause [1].
- If sleep is the main problem, sleep-specific options have their own evidence: see magnesium for sleep and waking at 3 a.m. in menopause.
Partners we link to
- WinonaPaid linkOnline menopause care for women aged 35 to 59 (its FAQ, checked Oct 11, 2026). It lists FDA-approved estrogen tablets, progesterone capsules and estrogen patches, plus compounded creams from its own 503A pharmacies that are not FDA-approved.See Winona's menopause plans (opens in new tab)
Partner links may earn us a commission. Learn more
- GalaPaid linkOnline hormone care for women. Its hormone page (checked Oct 11, 2026) lists estradiol pill or patch, oral or vaginal progesterone, vaginal estradiol and non-hormonal options, and says blood or saliva hormone tests are usually not needed. Eligibility is decided at intake.See Gala's hormone plans (opens in new tab)
Partner links may earn us a commission. Learn more
Quick answers
Does progesterone help you sleep?
In two small randomized trials of healthy postmenopausal women, 300 mg of micronized progesterone a day for about 3 weeks reduced time awake during the night [2][3]. In perimenopausal women, a 189-woman trial found better self-reported sleep quality on 300 mg at bedtime [5]. It is not FDA-approved as a sleep aid [1].
What dose of progesterone was used for sleep in studies?
The sleep trials used 300 mg of oral micronized progesterone a day, given at 11 p.m. or at bedtime where the timing was reported [2][3][5]. The labeled dose for protecting the uterus during estrogen therapy is 200 mg at bedtime for 12 days of each 28-day cycle [1]. Your prescriber decides the dose.
How long does progesterone take to help sleep?
The sleep-lab trials measured sleep after about 3 weeks of nightly use [2][3], and the perimenopause trial measured outcomes over 3 months [5]. In one trial, the first night of progesterone showed no change in normal, undisturbed sleep [2].
What are the side effects of progesterone at bedtime?
The Prometrium label warns of transient dizziness and drowsiness, which is why it is taken at bedtime, and says the capsules contain peanut oil [1].
Can I take progesterone for sleep after a hysterectomy?
Prometrium's labeled use for uterine protection applies to women with a uterus who take estrogen [1]. For anyone else, taking it for sleep is off-label, and whether it fits is a question for your prescriber.
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References
- [1]Prometrium (progesterone) capsules prescribing information. DailyMed, U.S. National Library of Medicine, 2026.
- [2]Progesterone prevents sleep disturbances and modulates GH, TSH, and melatonin secretion in postmenopausal women. J Clin Endocrinol Metab, 2011.
- [3]Progesterone reduces wakefulness in sleep EEG and has no effect on cognition in healthy postmenopausal women. Psychoneuroendocrinology, 2008.
- [4]Sleep in menopause: differential effects of two forms of hormone replacement therapy. Menopause, 2001.
- [5]Oral micronized progesterone for perimenopausal night sweats and hot flushes a Phase III Canada-wide randomized placebo-controlled 4 month trial. Sci Rep, 2023.
- [6]Different regimens of menopausal hormone therapy for improving sleep quality: a systematic review and meta-analysis. Menopause, 2022.
- [7]The 2022 hormone therapy position statement of The North American Menopause Society. Menopause, 2022.
- [8]Effects of hormone replacement therapy on endometrial histology in postmenopausal women. The PEPI Trial. JAMA, 1996.