Eight Sleep Pregnancy Mode: A Guide to Conquering Night Sweats & Overheating

As a lifestyle curator, I’m obsessed with what I call “High Lifestyle ROI.” These are the products that don’t just look pretty on a shelf but actually solve a friction point in your day-to-day life. When Eight Sleep announced their new Pregnancy Mode, I knew it was a game-changer for my “Best Goods for Good Life” community. We aren’t just talking about a “cool” mattress; we’re talking about an AI-driven environment that adjusts so you don’t have to.

Here is the data-driven blueprint for reclaiming your sleep, from the first trimester through those blurry postpartum weeks.

Why You’re Overheating: The Science of Pregnancy Night Sweats

If you feel like your internal thermostat is broken, it’s because, in a way, it is. During pregnancy, your blood volume increases by nearly 50%, and your metabolic rate sky-rockets. This creates a physiological phenomenon where your “thermoneutral zone”—the temperature range where your body feels comfortable—narrows significantly.

Research published in Fertility and Sterility highlights that over one-third of women experience hot flashes and night sweats during pregnancy, often peaking in the third trimester [1]. According to the Sleep Foundation, the surge in estrogen and progesterone directly interferes with your body’s ability to regulate its own temperature [2]. Essentially, your brain thinks you’re hotter than you actually are, triggering the “cooling” response (sweat) even if the room is technically cool. This leads to that frustrating cycle: you wake up hot, sweat until you’re damp, and then wake up shivering because you’re now wet and cold.

What is Eight Sleep Pregnancy Mode and How Does It Work?

For years, Eight Sleep has been the gold standard for athletes and tech enthusiasts, but their latest move into female-focused health is what really has me excited. Pregnancy Mode isn’t just a “cooler” setting; it’s an intelligent layer of the Autopilot AI designed specifically for the window between your first trimester and 24 weeks postpartum.

Dr. Nicole Moyen, Eight Sleep’s Senior Director of Science and Clinical Research, notes that the feature was born out of internal data from a study of 1,884 women, which showed a massive 5°F preference swing in bed temperature as women moved through different life stages [3], [4].

Trimester-Specific Temperature Adjustments

The system doesn’t just set one temperature and leave it. It evolves as you do:

• First Trimester: The focus is on the initial metabolic surge. The AI learns your new baseline as your resting heart rate begins to climb.
• Second & Third Trimesters: As your core temperature rises and physical discomfort makes it harder to stay in deep sleep, the Pod increases its cooling power during the “Deep Sleep” phase of your night.
• Postpartum (The First 24 Weeks): This is arguably the most critical phase. As your body sheds excess fluid and hormones shift again, night sweats often become more intense. The AI stays active to help stabilize your environment during those short windows of sleep between feedings.

Here’s the reality: I’ve seen plenty of “cooling” pads that just feel like sleeping on an ice pack. What makes this different is the journey the technology takes with you. I ignored the “smart bed” hype for a long time, thinking a good linen sheet set would solve it. It didn’t. What finally clicked for me was realizing that your temperature needs change throughout the night. You might need a warm bed to fall asleep, but your body needs to drop 2 degrees to hit REM. Eight Sleep handles that hand-off perfectly.

Micro-Verdict: The only system that actually “listens” to your body’s changing metabolic needs during pregnancy.

How to Set Up Eight Sleep for a Cooler Pregnancy Bed

Getting this set up is surprisingly intuitive, which is exactly what you need when “pregnancy brain” is in full swing. Once you have the Pod 4 Cover installed—which independent testing by CNET confirms can range from a chilly 55°F to a cozy 110°F—you’ll use the app to dial in your specifics [5].

1. Enable Pregnancy Mode: In the Eight Sleep app, navigate to the “Labs” or “Profile” section to find the pregnancy toggle.
2. Set Your Stage: You’ll input your approximate due date. This allows the Autopilot AI to reference that 1,884-woman dataset to predict when you’ll likely need more aggressive cooling.
3. The Dual-Zone Win: This is my favorite “Jordan Tip.” If your partner is one of those people who is always freezing, you can set your side to “Arctic” while their side stays at a comfortable 72°F. No more thermostat wars.

The Best Bed Temperature for Pregnancy Sleep

While the Pod does the heavy lifting, your environment still matters. Most sleep experts, including the Sleep Foundation, suggest a room temperature between 60–67°F (15.5–19.4°C) for optimal sleep [2]. During pregnancy, many women find that hitting exactly 65°F is the “sweet spot” to prevent the onset of a hot flash [5].

However, there is a difference between room temperature and bed-surface temperature. While your AC cools the air, it doesn’t stop the foam in your mattress from trapping your body heat. This is where active cooling (like water-based systems) outperforms passive cooling (like fans or “cooling” gels).

The Pregnancy Sleep Loadout

If you’re building your sanctuary, here is how I recommend layering your “High ROI” items:

• Essential: 100% long-staple cotton or bamboo sheets (breathability is non-negotiable)
• Essential: An adjustable pregnancy wedge pillow to support the “SOS” (Sleep on Side) position
• Essential: A smart cooling system like the Eight Sleep Pod to manage surface heat
• Pro Upgrade: A dedicated bedroom dehumidifier if you live in a climate like Austin; dry air makes cooling more effective

Comparing the Field: Eight Sleep vs. Chilipad vs. BedJet

I’m all about being honest—Eight Sleep is an investment. If you aren’t ready for the full Pod system, there are other ways to tackle smart bed cooling.

If you’re someone who feels “suffocated” by heavy blankets, you might look at the BedJet. Instead of water, it uses a stream of air to wick away moisture. It’s excellent for immediate relief from night sweats during pregnancy, though it doesn’t have the AI-tracking “Pregnancy Mode” that Eight Sleep offers.

For those who want a simpler water-based approach, the Chilipad Dock Pro offers a similar temperature range (55–115°F). While it lacks the biometric sensors to track your HRV or sleep stages, it is a workhorse for consistent, manual cooling. Interestingly, a 2025 study on the Perfectly Snug Smart Topper showed that 100% of participants reported improved sleep through autonomous thermoregulation, proving that this tech is move than just a luxury—it’s a legitimate sleep aid [6].

Micro-Verdict: If you want “set it and forget it” AI, go Eight Sleep; if you want raw cooling power without the data, look at Chilipad.

Safety First: When Overheating Becomes a Risk

While we’re focused on comfort, we have to talk about safety. There is a difference between feeling “hot” and having a core temperature that is actually elevated.

According to research in the Annals of Epidemiology, a maternal core temperature of 102°F (39°C) or higher can increase the risk of neural tube defects, especially in the first trimester [7]. This is why doctors advise against hot tubs and saunas. Using a cooling bed is generally considered a safe pregnancy sleep comfort solution because it helps lower or stabilize your temperature rather than raising it.

However, you should always consult your OB-GYN if you experience:

• A fever over 100.4°F
• Chills or “cold sweats” that feel like the flu
• A sudden rash accompanied by heat
• Reduced fetal movement

The American College of Obstetricians and Gynecologists (ACOG) emphasizes that while environmental cooling is great for comfort, it shouldn’t be used to “mask” a fever that might indicate an infection [8].

Making Every Night a Little Better

Pregnancy is a marathon, and you can’t run a marathon without recovery. While we can’t turn off the hormones or the middle-of-the-night kicks, we can control the environment. Investing in your sleep architecture isn’t just about a fancy bed; it’s about giving your body the best possible chance to rest before your newest family member arrives.

Whether you choose the high-tech path with Eight Sleep’s Pregnancy Mode or stick to the basics of fans and cotton, remember: you don’t have to just “tough it out.” Your space should support you.

Check out our full review of the Eight Sleep Pod 4 Cover for a deeper look at the hardware.

Disclaimer: This article provides sleep comfort suggestions based on lifestyle curation and available research. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or core body temperature during pregnancy.

Sources & Expert References

1. Thurston, R. C., et al. (2013). “Nighttime hot flashes during pregnancy and postpartum: a prospective evaluation.” Fertility and Sterility.
2. Sleep Foundation. (2024). “The Ideal Temperature for Sleep.” SleepFoundation.org
3. Moyen, N. (2024). “Why we built Pregnancy Mode.” Eight Sleep Science Communications.
4. Eight Sleep. (2023). “How Women Adjust Pod Temperatures Across Life Stages: A Study of 1,884 Members.” EightSleep.com/blog
5. CNET. (2024). “Eight Sleep Pod 4 Review: The Smartest Way to Cool Your Bed.” CNET.com
6. Gartenberg, D. (2025). “SleepSpace Study: The Impact of Autonomous Thermoregulation on Sleep Quality.”
7. Annals of Epidemiology. (2011). “Periconceptional hyperthermia and the risk of neural tube defects.”
8. American College of Obstetricians and Gynecologists (ACOG). (2023). “Physical Activity and Exercise During Pregnancy and the Postpartum Period.” Guidelines.