If you've ever been pregnant (or know someone who has), you know that sleep gets harder as the pregnancy progresses. One minute you're freezing, the next you're waking up to night sweats. Most likely, your sleep environment hasn't changed, but your body has.

Eight Sleep, the company behind the Pod smart mattress cover and sleep tracker, just launched Pregnancy Mode, an AI-powered system built for the physiological changes brought on from pregnancy and postpartum. It's available now as a free app update for all Eight Sleep members with a paid Standard, Enhanced or Elite subscription ($17 to $33 per month).

When you activate Pregnancy Mode within the app, the system uses your pre-pregnancy temperature baseline, your last menstrual period date and your estimated due date to automatically calculate weekly temperature adjustments across all sleep stages.

Eight Sleep's dataset of over 100 pregnant members and 50,000 nights of sleep data found that in the early stages of pregnancy, your body tends to sleep warmer (about 0.4 to 0.7 degrees Fahrenheit) than your pre-pregnancy baseline temperature. The study also found that by the third trimester, it's the complete opposite -- pregnant people were setting their Pods nearly 3.5 degrees cooler than normal. Pregnancy Mode also tracks that curve and continues to adjust eight weeks postpartum.

The feature includes a dedicated Pregnancy Insights card in the app, where you can see weekly biometric summaries of your heart rate, heart rate variability, respiratory rate, sleep stages and snoring. It'll also compare these metrics to your pre-pregnancy scores. 

Baby development milestones and prenatal visit reminders are part of this new feature, too. Partners sharing the bed will get their own weekly insights on what to expect and how to help their pregnant significant other.

Pregnancy Mode is now available in the Eight Sleep app on iOS and Android.