Good. You found it. Whether you just Googled “why am I waking up at 3am every night” or you’ve been suspicious for a while that something hormonal is going on, this page is meant to give you a quick foundation before you go anywhere else on the site.
What perimenopause actually is
Perimenopause is the transition period before menopause, and it can start as early as your late 30s. Most women have no idea it’s coming that early. Estrogen and progesterone levels don’t just decline — they fluctuate, sometimes wildly, which is why symptoms can feel so unpredictable. One week fine, the next week falling apart for no reason you can identify.
It typically lasts 4 to 10 years. Menopause itself is just one day: the 12-month anniversary of your last period. Everything before that is perimenopause.
Estrogen receptors are throughout your body — brain, gut, skin, joints, cardiovascular system. When estrogen starts swinging, all of those systems feel it. Which is why the symptom list is so long and so all-over-the-place.
Symptoms (the list your doctor might not have mentioned)
Not everyone gets all of these. Some women get a handful. Some get the full collection. The most common ones: sleep disruption (trouble falling asleep, waking at 3am, waking drenched), brain fog (word loss, can’t concentrate, processing feels slow), anxiety that appeared out of nowhere, mood changes (irritability, low mood, feeling like yourself but worse), hot flashes and night sweats, irregular or heavier periods, weight changes especially around the midsection, heart palpitations, joint pain, vaginal dryness and changes in libido, and fatigue that sleep doesn’t fix.
If you’re nodding at more than three of those, you’re probably in the right place.
Where to start reading
Start wherever your most urgent problem is:
Sleep: If you’re waking up at 2 or 3am and can’t get back to sleep, start with why perimenopause wrecks sleep and what to do about it. This is where most people get the fastest wins.
Brain fog: If you’re forgetting words, losing your train of thought, or quietly worrying it might be something worse, the brain fog post is for you. (It’s almost certainly not something worse.)
Anxiety: If anxiety showed up out of nowhere in your 40s and you can’t figure out why, read why perimenopause causes anxiety and what actually helps. The progesterone-GABA connection explains a lot.
Supplements: The magnesium post is a good entry point. Magnesium is one of the few supplements with real evidence behind it for this stage of life, and it’s inexpensive enough to try without much risk.
Weight gain: If the scale is creeping up despite nothing changing, or your belly is doing things it never did before, read why perimenopause causes weight gain — and what the research actually says helps.
Hormones and HRT: Coming soon. Big topic, want to do it justice.
Hot flashes: If you’re suddenly sweating through your shirt at 2am or getting hit with waves of heat at inconvenient moments, the hot flashes post covers why they happen and what actually helps.
A few things worth knowing about this site
I’m a registered nurse, not a doctor. Nothing here is medical advice. I write about what the research says and what worked for me. Your situation is yours, and some of this will apply to you and some won’t.
Some links on this site are affiliate links. If you buy something through one of them, I make a small commission at no extra cost to you. I only link to things I’d actually use or recommend to a patient.
If you want to know more about who I am and why I built this, the About page has the full story.