The short answer. Postpartum night sweats happen because estrogen and progesterone fall sharply after birth while your body sheds the extra fluid it held during pregnancy. Cleveland Clinic reports that around 35% of people who have recently given birth experience them, that they are usually worst in the first two weeks and that they typically settle within a few weeks. Wear something light and breathable that opens easily for feeding, and protect the bed underneath you.
Why it happens
During pregnancy your body retains a significant volume of extra fluid. After delivery it has to release that fluid, and sweating is one of the ways it does so. At the same time estrogen and progesterone levels drop steeply. That drop affects the hypothalamus, which is the part of the brain that regulates body temperature. The result is a temperature control system briefly working from outdated instructions, which is why you can wake soaked in a cool room.
This is a normal and common part of recovery. It is also worth telling your provider about, because night sweats accompanied by fever or chills can point to something that needs attention.
How long it lasts
Cleveland Clinic notes that postpartum night sweats are typically at their worst during the first two weeks and usually resolve within a few weeks as hormone levels stabilize. They can continue longer if you are breastfeeding, because lactation keeps estrogen levels low. Knowing the likely window helps, because it makes the problem finite rather than open ended.
What to wear
Something that opens for feeding
This is the requirement that quietly rules out most options. At three in the morning you do not want to remove a garment entirely to feed a baby. A button front top solves it. The Long-Sleeve Lounge Top and the Short-Sleeve Lounge Top were both cut with discreet nursing access for this reason, so you are not choosing between practicality and something you like wearing.
A fabric that moves moisture
Cleveland Clinic recommends light pajamas made of cotton or silk and cotton sheets, on the basis that they are more breathable. Viscose derived from bamboo belongs in the same category. It absorbs moisture readily and has a smooth fiber surface, so it sits cool against the skin and does not cling once you are damp. Whatever you choose, the principle is the same. Breathable and light beats warm and heavy during these weeks.
Something loose
Your body is changing week to week and nothing should be pressing on it. A relaxed cut leaves air between fabric and skin, and that air is what carries heat away. It also removes the question of what size you are right now, which is one less thing to think about.
Something you can answer the door in
People visit. Meals arrive. In the postpartum weeks the line between resting and receiving guests effectively disappears. Loungewear that reads as clothing means you are not changing before every visitor, and it is the reason Kuula makes loungewear rather than sleepwear.
Protect the bed
Cleveland Clinic suggests placing a bath towel under your body to absorb sweat, adding a second pillowcase and using a waterproof mattress protector under the sheets. These are unglamorous and they work. Changing a towel at three in the morning is considerably easier than changing a fitted sheet.
If you are buying this for someone else
Gifts for a new mother tend to arrive addressed to the baby. Something soft that fits her body as it is now, opens for feeding and does not need to be the right size lands differently. The Nightie and the Everyday Lounge Tank both work without precise sizing. A Kuula gift card removes the question altogether.
Frequently asked questions
How common are postpartum night sweats?
Cleveland Clinic reports that research suggests approximately 35% of people who have recently given birth experience them, which makes them normal and common.
How long do postpartum night sweats last?
They are usually worst during the first two weeks after birth and typically resolve within a few weeks as hormones stabilize. They may last longer while breastfeeding, because lactation keeps estrogen levels low.
What should I sleep in with postpartum night sweats?
Something light, loose and breathable that opens for feeding. Cotton and silk are commonly recommended, and viscose derived from bamboo behaves similarly. Protect the mattress and keep a spare set within reach of the bed.
When should I call my doctor about night sweats after birth?
If sweating comes with fever, chills or any sign of infection, contact your provider. Night sweats on their own are a normal part of recovery but your provider is the right person to confirm that.
Sources
Cleveland Clinic, Postpartum Night Sweats: Causes and Treatments
Cleveland Clinic, Postpartum Sweating and Body Odor Are Normal
Kuula makes loungewear. Nothing here is medical advice, and Kuula does not treat, prevent or cure any condition. Speak with your healthcare provider about postpartum recovery.