Progesterone for Sleep: What the Label and the Trials Say

Why progesterone is prescribed with estrogen

If you still have a uterus, estrogen taken alone can cause the lining of the uterus to overgrow. The estrogen labels state that there is an increased risk of endometrial cancer in a woman with a uterus who uses unopposed estrogen, and that adding a progestogen has been shown to reduce the risk of endometrial hyperplasia, which may be a precursor to endometrial cancer. Labels also say a woman without a uterus generally does not need a progestogen.

This is the approved use of Prometrium (micronized progesterone capsules): prevention of endometrial hyperplasia in postmenopausal women with a uterus who are receiving conjugated estrogens. In the label's 3-year trial of 358 women with an intact uterus, hyperplasia occurred in 6 percent of women taking Prometrium plus conjugated estrogens versus 64 percent of those taking the estrogen alone. The label lists secondary amenorrhea as the other indication. Sleep is not listed.

What the Prometrium label says about timing and drowsiness

For endometrial protection the label describes 200 mg taken as a single daily dose at bedtime for 12 days of each 28-day cycle alongside daily conjugated estrogens. Doses used in practice can differ, and your prescriber sets yours.

The label also states that Prometrium may cause transient dizziness and drowsiness and should be used with caution when driving or operating machinery, and advises taking it as a single dose at bedtime. That is why bedtime dosing is standard. In the label's placebo-controlled trial, dizziness was reported by 15 percent of women on progesterone plus estrogen versus 9 percent on placebo.

Two other label points are worth knowing: the capsules contain peanut oil and are contraindicated for people with a peanut allergy, and other contraindications include breast cancer, active or past blood clots, and liver disease. For the wider set of effects and warnings, see our guide to HRT side effects.

What research shows about sleep

A 2021 systematic review and meta-analysis in the Journal of Clinical Endocrinology and Metabolism (Nolan, Liang and Cheung) looked at randomized trials of micronized progesterone and sleep. It found 9 randomized trials with 388 participants, and 8 of them enrolled postmenopausal women. Polysomnography (overnight sleep lab) results were inconsistent. Across 4 trials, progesterone did better than placebo for sleep onset latency but not significantly for total sleep time or sleep efficiency. Self-reported sleep improved in most trials. The authors note that concurrent estradiol use and improvement in hot flashes limit what can be concluded from some studies, and they call for larger trials of progesterone on its own.

Two small trials from a German group give a flavor of the evidence. In a 2008 randomized, double-blind crossover study of 10 healthy postmenopausal women aged 54 to 70, 300 mg of oral micronized progesterone for 21 days reduced time spent awake during sleep and increased REM sleep in the first third of the night, with no effect on cognition. In a 2018 crossover study of 12 postmenopausal women, a 9 mg intranasal progesterone dose and zolpidem both promoted sleep, though progesterone's EEG pattern did not resemble that of GABA-active drugs.

These are small samples, short durations, and, in the second case, a different route and product than the capsule at the pharmacy. They support continued study, not a promise that progesterone will fix poor sleep.

Other things that affect sleep around menopause

Trouble sleeping is one of the listed symptoms of perimenopause and menopause, alongside hot flashes and night sweats. If night sweats are waking you, treating the hot flashes may matter more than the pill you take at night. MedlinePlus lists cognitive behavioral therapy for sleep problems and good sleep habits among the options, along with non-hormone medicines and hormone therapy. Persistent insomnia can also have causes unrelated to hormones, so mention it to your provider.

Read more about sleep issues, the difference between perimenopause and menopause, and estradiol patch vs pill.

Questions to ask your provider

• Do I have a uterus, and do I therefore need a progestogen with my estrogen?
• Should I take progesterone at bedtime, and what should I do if I feel drowsy or dizzy the next morning?
• Are my night sweats or hot flashes the reason I am not sleeping, and would treating them help?
• Do I have a peanut allergy, a history of blood clots, breast cancer, or liver disease that changes my options?
• How will we decide whether the plan is working, and when should we reassess?

Estrogen and progestogen labels recommend the lowest effective dose and periodic reevaluation, so expect your plan to be adjusted over time rather than set once.

How it works at Gala

A licensed provider reviews your online intake and prescribes only if treatment is appropriate for you. Gala offers progesterone for people who take estrogen and have a uterus, alongside estradiol as a pill or patch, vaginal estradiol, and non-hormonal options. No insurance is required, your care team is available by message to adjust your dose, and medication ships to your home. Visit the hormone health hub or start your online menopause assessment.

Sources

1. Acertis Pharmaceuticals. Prometrium (progesterone) capsules prescribing information. NLM DailyMed.
2. Bayer HealthCare. Climara (estradiol transdermal system) prescribing information. NLM DailyMed.
3. Nolan BJ, Liang B, Cheung AS. Efficacy of micronized progesterone for sleep: a systematic review and meta-analysis of randomized controlled trial data. J Clin Endocrinol Metab. 2021.
4. Schüssler P, et al. Progesterone reduces wakefulness in sleep EEG and has no effect on cognition in healthy postmenopausal women. Psychoneuroendocrinology. 2008.
5. Schüssler P, et al. Sleep after intranasal progesterone vs. zolpidem and placebo in postmenopausal women. Psychoneuroendocrinology. 2018.
6. MedlinePlus, National Library of Medicine. Menopause.

This article is for general information and is not medical advice. Talk to a licensed provider about your own health.