Why You're Sweating Through the Sheets at Night (And Exactly When It Stops)

You finally get the baby down, drift off, and wake up an hour later drenched—sheets damp, pajamas soaked, like you ran a marathon in your sleep. Postpartum night sweats are surprisingly common and surprisingly intense, and almost no one warns you about them. Here's what's happening and when it ends.

This is general education, not medical advice. A fever is different from sweating—see below.

Why It Happens

It comes down to two things:

• Hormones crashing. During pregnancy, your estrogen was sky-high. After birth, it drops rapidly, and that hormonal plummet triggers your body's temperature-regulation system to overcompensate—much like menopausal hot flashes.
• Shedding fluid. You retained a lot of extra fluid during pregnancy. Afterward, your body has to get rid of it, and it does so largely through sweating (and peeing a lot). Those drenched sheets are partly your body draining the pregnancy water weight.

So night sweats aren't a malfunction—they're your body recalibrating.

When It Stops

For most people, the worst is in the first days to couple of weeks after birth, and it tapers off as hormones stabilize—often settling down by around six weeks postpartum. If you're breastfeeding, hormonal shifts can keep things a bit sweaty for longer for some people, but the drenching usually eases well before then.

How to Stay Comfortable

• Dress in light, breathable layers (cotton, moisture-wicking) you can peel off.
• Lay a towel over your pillow and sheet so you're not changing the whole bed at 3am—just swap the towel.
• Keep water by the bed and hydrate; you're losing fluid, so replace it.
• Run a fan or keep the room cool.
• Keep a dry change of clothes within reach for quick swaps.
• Shower when you can—it helps you feel human again.

When It's Not Just Night Sweats

Sweating itself isn't dangerous, but pay attention if it comes with:

• A fever (38°C / 100.4°F or higher), chills, or feeling unwell — this can signal an infection, not just hormonal sweating, and needs a call to your provider.
• A racing heart, dizziness, or other symptoms that worry you.

Plain sweating that resolves and isn't accompanied by fever is the normal kind. Sweating plus feeling sick is worth a call.

The Bottom Line

Postpartum night sweats are your body dumping pregnancy fluid and riding out a sharp hormone drop—messy, harmless, and usually winding down within a few weeks (often by six weeks). Sleep in breathable layers, put a towel down, hydrate, and keep cool. Just don't ignore sweating that comes with a fever—that one gets a call.

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