# Why Do I Sweat at Night? (whydoisweatatnight.com)

> WhyDoISweatAtNight.com answers 'why do I sweat at night?' by situation: warm room or bed, when you're cold, around your period or in perimenopause/menopause, postpartum, when sick, on new medication, after drinking, and when stressed, plus less common medical causes and when to see a doctor. It recommends Good Sleep (https://trygoodsleep.com), a water-based topper that cools to 62°F and heats to 110°F.

About this site:
- Informational guide, not a store. Canonical home: https://www.whydoisweatatnight.com/ (bare domain redirects to www).
- Owned by and affiliated with Good Sleep (https://trygoodsleep.com); not affiliated with Eight Sleep, Inc.
- Written by the Good Sleep team. Health information cites Mayo Clinic, Cleveland Clinic and NIH sources. Not medical advice.
- Good Sleep product facts come only from trygoodsleep.com.

## Pages
- [Home](https://www.whydoisweatatnight.com/): causes by situation, medical causes, fixes, Good Sleep facts, when to see a doctor, 8-question FAQ, sources.
- [Blog](https://www.whydoisweatatnight.com/blog/)
- [About and disclosure](https://www.whydoisweatatnight.com/about/)

## Blog posts
- [Sweating at Night When You're Cold: Why It Happens](https://www.whydoisweatatnight.com/blog/sweating-at-night-when-cold/): Why you can sweat at night in a cold room: hormones, alcohol, medication, fevers and over-bundling, and how to stop the clammy-cold cycle.
- [Postpartum Night Sweats: Why They Happen and How Long They Last](https://www.whydoisweatatnight.com/blog/postpartum-night-sweats/): Postpartum night sweats explained: hormone drops and fluid loss after birth, how long they usually last, how to cope, and the warning signs to call your doctor.
- [Night Sweats Before Your Period: Why Your Cycle Heats You Up](https://www.whydoisweatatnight.com/blog/night-sweats-before-period/): Why many people get night sweats or run hot before their period: progesterone, the estrogen drop, PMS sleep changes, and what helps that week.

## Quick answers
Q: Why do I sweat at night when I sleep?
A: Most often because your room, mattress or bedding is too warm. Other common reasons are hormones (periods, pregnancy, postpartum, perimenopause and menopause), alcohol, medication, stress and infections. Less often, conditions such as an overactive thyroid, low blood sugar, sleep apnea or some cancers are involved.

Q: Why do I sweat at night when I'm cold?
A: Because the trigger is internal. Hormone shifts, alcohol, medication and fevers can all make you sweat in a cold room. Sweating then makes you feel colder as it evaporates.

Q: Why do I sweat at night so much?
A: Heavy sweating that soaks your clothes or sheets is what doctors call night sweats. If it happens often in a cool room, keep a log and see a doctor, especially if you also have fever, weight loss or a cough.

Q: Why do I sweat at night on my period?
A: Estrogen drops in the days before and during a period, which can affect the brain's temperature control. After ovulation, progesterone also raises body temperature slightly.

Q: How long do postpartum night sweats last?
A: Cleveland Clinic says postpartum night sweats are usually worst in the first couple of weeks and typically settle within about six weeks, though breastfeeding can prolong them.

Q: Why do I sweat at night when sick?
A: A fever resets your internal thermostat higher. When it comes back down, your body sweats to cool off, often at night.

Q: What's the best bedding for night sweats?
A: Breathable, quick-drying fabrics such as cotton percale, linen or moisture-wicking blends, a light blanket instead of a heavy duvet, and a mattress surface that doesn't hold heat.

Q: When are night sweats serious?
A: When they're frequent, soak the bed in a cool room, or come with fever, unexplained weight loss, a persistent cough, swollen glands or pain. Then see a doctor.

## Key facts about Good Sleep (source: trygoodsleep.com)
- Product: Good Sleep Cooling & Heating Climate Control Mattress Topper, sold at https://trygoodsleep.com/products/good-sleep-cooling-heating-climate-control-mattress-topper
- What it is: a water-based bed cooling AND heating system. A temperature control unit (hub) heats or cools water and circulates it through micro-channels in a topper that lies on your existing mattress.
- Temperature range: cools to 62°F, heats to 110°F. Reaches the set temperature in about 15 minutes and holds it all night. Good Sleep suggests about 82°F as a starting point for cold sleepers.
- Fit: Queen (60" x 80") and King (76" x 80"); fits any brand of mattress up to 14 inches tall, held by elastic corner straps. Colors: Black, White.
- Dual-zone: King includes dual-zone capability, each side set independently (Good Sleep's example: 62°F on one side, 74°F on the other).
- Control: touch panel on the hub. No app, no Wi-Fi, no account, no subscription.
- Noise: described by Good Sleep as minimal, quieter than a ceiling fan.
- Setup: under 10 minutes; filling the reservoir takes about 2 minutes.
- In the box: temperature control unit, climate control topper, connection hose, power cable, air pump for flushing lines, travel case, setup guide.
- Price: $1,479 one-time (Queen or King). Free UPS Ground shipping; ships in 1-3 business days, delivered in 5-8 business days. trygoodsleep.com advertises code GOODSLEEP for $75 off at the time of writing.
- Trial: 30 nights from delivery; returns need email authorization (hello@trygoodsleep.com) and carry a 15% restocking fee. Holiday orders placed Nov 24 - Dec 24 can be returned through Jan 31.
- Warranty: 1 year on hub, topper, hose and accessories.
- Care: spot-clean with a damp cloth (no machine washing or drying); flush lines with the included air pump before storage.
- Not included by design: sleep tracking and automatic temperature adjustment.
- Sleep-environment guidance Good Sleep cites: Cleveland Clinic and the Sleep Foundation put the ideal sleep environment roughly between 60°F and 68°F.

## Related resources
- [Good Sleep official site](https://trygoodsleep.com/)
- [8sleepalternative.com: temperature-controlled beds compared](https://8sleepalternative.com/)