Eight Sleep Pregnancy Mode: Optimising 9-Month Comfort

This article explains how the leading sleep tech uniquely regulates your sleeping temperature as your pregnancy progresses.

Pregnancy disrupts your sleep. Your basal body temperature rises by 0.3 to 0.5°C in the first trimester. Your blood volume increases by around 45% by late pregnancy. Your resting heart rate climbs 15 to 20 beats a minute. Your heart rate variability drops. Around a third of pregnant women get hot flashes.

The bed you slept well in before pregnancy was set up for a different body. Your temporary new body now runs hotter, harder, and more variably every night, for nine months.

Why pregnancy disrupts sleep, and why ordinary cooling fails

To fall into deep regenerative sleep, your core temperature must drop by about 1°C. Your body does that by releasing heat through your skin. Pregnancy works against the drop on every count: more heat, more blood to circulate, less efficient cooling. About 78% of pregnant women say their sleep is disturbed.

The usual fixes do not work. Air conditioning cools the room evenly, so it cools your partner, too. Fans dry the air and add noise. Cooling sheets work for ten minutes, then warm up. Opening a window does nothing about the heat coming off your skin. Heat leaves your body through the surface in contact with it, and that surface is your bed.

How Eight Sleep’s Pregnancy Mode works

The Pod is a cover that fits over your existing mattress. Water flows through it at a temperature you set, or one the system sets for you. Each side of the bed runs independently. Built-in sensors read your heart rate, heart rate variability, breathing rate, and movement. No wristband, no chest strap, nothing worn on the body.

Pregnancy Mode adapts to a changing you in three ways.

• You enter your due date in the app. The Pod knows which week of pregnancy you are in and adjusts cooling according to a schedule that runs from the first trimester through 24 weeks after birth.
• It cools ahead of the change, not after it. Standard Autopilot reacts to your sleep data. Pregnancy Mode runs a schedule built from 45,000 nights of pregnancy sleep data, and pre-empts the rise in body temperature the next week will bring.
• It reads your numbers in the context of pregnancy. A drop in HRV at week 28 is not the same as a drop at week 8. The app shows you what is normal for your stage and how you compare to your own pre-pregnancy baseline.

Designed to address menopausal temperature changes or the effects of excessive exercise, Hot Flash (hot flush) mode also works in pregnancy mode when needed. Eight Sleep’s own data show that pregnant women set the Pod to around 3°F cooler than baseline by the third trimester, returning to baseline around 8 weeks after birth.

Better sleep, with knock-on effects

Better sleep during pregnancy is associated, in peer-reviewed research, with five things that matter to mother and baby: lower risk of gestational diabetes, lower risk of preeclampsia and pregnancy hypertension, lower risk of perinatal depression and anxiety, shorter labour and fewer caesareans, and stronger postpartum recovery.

Eight Sleep is not a medical device and does not prevent any of these conditions. I cannot make assertions about improved temperature management and pregnancy outcomes. The Pod improves your sleep. Your sleep is linked to the outcomes above. The benefit comes through better sleep, not directly through the bed. The science is linked at the foot of this article for you to make up your own mind.

Pregnancy night sweats: what the Pod actually does

The Pod cools the surface in contact with your skin, which is where heat actually leaves the body. Hot Flash mode adds a stronger, faster cool when it detects an episode starting. You do not have to wake up or reach for the app. The cooling happens. The data shows up the next morning.

Different temperatures for you and your partner

Bedroom temperature is one of the quiet, repeating arguments of pregnancy. The Pod removes it.

Better daytime mood and energy

The research-linked outcomes from earlier in this article take months to matter. Mood and energy are felt in the first week.

More accurate biometric tracking than a wrist wearable

The Pod’s sensors are in the cover, under your body. They do not move. They do not need to be charged. They are not removed. For heart rate, heart rate variability, and breathing during sleep, a bed-based sensor is a stronger recording position than a watch on a moving wrist. The difference matters more during pregnancy, when those numbers are themselves shifting every week.

What you actually pay

The Pod 5 cover starts at around £2,000 to £2,500 in the UK, depending on size, plus £17 a month (or £199 a year) for the Eight Sleep Autopilot membership required to run Pregnancy Mode. Eight Sleep ships to the UK, runs a 30-night risk-free home trial with full refund, and offer 0% APR financing over 36 months through Affirm. The full pricing breakdown by Pod 5 model is in my main Eight Sleep review.

Realistically, this is a 5- to 10-year purchase, so spread across the product’s working life, the running cost falls comfortably under £50 a month for active temperature management every night, plus postpartum and recovery use afterwards. The Pod does not stop working when the baby is born.

Cheaper bed-cooling systems exist, such as the Chilipad and BedJet, that require no subscription. They do not track sleep, run an automated schedule, or have a pregnancy layer and are significantly inferior products. The Pod sits at the top of the category for adaptive automation and biometric data, and is priced accordingly. It’s really a one-of-a-kind product.

Should you buy it?

This is the right product if you want active temperature control through pregnancy and beyond, you sleep next to a partner with different temperature preferences, and you’re willing to spend.

Eight Sleep is widely used at the elite end of professional sport. Mercedes-AMG Petronas F1 use it across the team. EF Pro Cycling’s head doctor uses it with his riders. It is also my own favourite sleep tool, with three years of personal use behind me.

The link below applies the largest available discount to your order and supports the independent work on this site. The 30-night home trial lets you try the Pod and Pregnancy Mode in your own bed, and return it for a full refund if it does not deliver.

EightSleep Pod 5

Excellent. Expensive. Silent.

rrp$3,049

up to $600 off

+other retailers

FAQs

Is Eight Sleep safe to use during pregnancy?

Yes. The Pod cools the sleeping surface by circulating water through a cover. There is no contact with your body beyond the cover’s temperature. Eight Sleep built Pregnancy Mode specifically for pregnancy and the early months after birth. If you have specific medical concerns, raise them with your obstetrician.

When should I start using Pregnancy Mode?

First trimester. The mode is designed to run continuously from week one through 24 weeks after birth. You can activate it later, and it will calibrate from your current week. Starting earlier gives a cleaner baseline.

Does Pregnancy Mode work after the baby is born?

Yes, for 24 weeks. It manages the hormonal night sweats common in the first two to three months after birth, which matters especially if you are breastfeeding. After that, the Pod returns to standard Autopilot.

How is Pregnancy Mode different from the standard Pod?

Standard Autopilot learns from your own sleep data. Pregnancy Mode runs a schedule anchored to your week of pregnancy, built from 45,000 nights of pregnancy sleep data. It cools ahead of the changes, not after them, and reads your numbers in the context of pregnancy.

What does the research say about sleep and pregnancy outcomes?

The associations cited in this article are drawn from peer-reviewed research:

• Gestational diabetes and short sleep: Reutrakul et al., 2018, Sleep Medicine Reviews (PMID 29198616), pooled OR 1.70 for sleep under seven hours.
• Preeclampsia and sleep-disordered breathing: Pamidi et al., 2014, American Journal of Obstetrics and Gynecology (PMID 24360515), pooled aOR 2.34.
• Perinatal depression and antenatal sleep: Fu et al., 2023, Journal of Affective Disorders (PMID 36963366), OR around 3.46.
• Labour duration and caesarean rate: Lee and Gay, 2004, American Journal of Obstetrics and Gynecology (PMID 15592289), 4.5-fold caesarean risk for sleep under 6 hours in late pregnancy.
• Pregnancy physiology, including the 45% blood volume increase and basal temperature rise: Soma-Pillay et al., 2016, Cardiovascular Journal of Africa (PMID 27354921).
• HRV and resting heart rate across gestation: Sarhaddi et al., 2022, Sensors (PMID 35759282).
• Hot flash prevalence: Thurston et al., 2013, Fertility and Sterility (PMID 24035604).
• Sleep disturbance prevalence: Mindell et al., 2015, Sleep Medicine (PMID 25666847).

These are associations between sleep quality and pregnancy outcomes. The Pod improves sleep quality. It is not a clinical intervention and does not prevent any of these conditions.

EightSleep Pod 5

Excellent. Expensive. Silent.

rrp$3,049

up to $600 off

+other retailers

Last Updated on 6 May 2026 by the5krunner

the5krunner

tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. ID