CircadiaOS
CircadiaOS is an app that learns your sleep patterns from a wearable and automatically adjusts your existing thermostat overnight to optimize bedroom temperature for better sleep—no new hardware required.
https://circadiaos.com/?ref=producthunt
Product Information
Updated:May 29, 2026
What is CircadiaOS
CircadiaOS is a sleep-temperature automation platform designed to improve sleep by managing your room temperature for you. Instead of relying on manual thermostat changes, it connects to compatible wearables and smart thermostats, then uses your sleep data to tailor nightly temperature adjustments. The product is built to work with what many people already own, supporting popular thermostat brands (Nest, Ecobee, Honeywell) and wearables (Whoop, Oura Ring, Apple Watch, Garmin, Fitbit).
Key Features of CircadiaOS
CircadiaOS is an app-based sleep optimization system that learns your sleep patterns over time and automatically adjusts your bedroom temperature each night to match the body’s natural temperature curve during sleep. It connects to existing smart thermostats and popular wearables, requires no new hardware, and aims to improve sleep quality by aligning ambient room temperature with your sleep stages—from falling asleep through deep sleep to waking.
Wearable + thermostat integration: Links supported wearables (e.g., Whoop, Oura Ring, Apple Watch, Garmin, Fitbit) with compatible thermostats (e.g., Nest, Ecobee, Honeywell) to coordinate sleep data with temperature control.
14-night calibration learning period: Uses an initial calibration window (over roughly 14 nights) to learn individual sleep patterns before applying automated optimization.
Automated nightly temperature optimization: Adjusts room temperature automatically every night without manual changes, aiming to keep the environment aligned with your sleep needs.
Circadian-inspired temperature curve method: Targets the typical sleep physiology pattern where core body temperature drops after sleep onset, bottoms out during deep sleep, and rises approaching wake time.
No new hardware required: Works with devices many users already own, reducing setup cost and friction compared with dedicated sleep-climate hardware.
Use Cases of CircadiaOS
Personal sleep improvement at home: Individuals can automate bedroom temperature changes to reduce wake-ups due to overheating/overcooling and maintain a more consistent sleep environment.
Athlete recovery optimization: Athletes using wearables can pair recovery-focused sleep tracking with automated temperature control to support deeper, more restorative sleep.
Smart home energy + comfort automation: Households can balance nighttime comfort with automation, potentially minimizing unnecessary heating/cooling by tailoring temperature changes to actual sleep patterns.
Couples/household sleep scheduling: Homes with different sleep schedules can use data-driven automation to better match temperature behavior to real sleep timing rather than fixed thermostat schedules.
Wellness programs and coaching add-on: Sleep coaches or wellness programs can recommend automated temperature alignment as a practical intervention alongside sleep hygiene and wearable-based monitoring.
Pros
No new hardware needed—leverages existing thermostats and wearables.
Automated temperature changes reduce manual effort and nightly guesswork.
Broad compatibility with common thermostat and wearable ecosystems.
Cons
Requires compatible thermostat and wearable to get full functionality.
Needs a multi-night calibration period before delivering optimized automation.
Effectiveness may vary by home HVAC responsiveness, insulation, and personal temperature preference.
How to Use CircadiaOS
1. Confirm compatibility: Make sure you have a supported thermostat (Nest, Ecobee, or Honeywell) and a supported wearable (Whoop, Oura Ring, Apple Watch, Garmin, or Fitbit).
2. Install CircadiaOS: Download and install the CircadiaOS app from the App Store.
3. Open the app and start setup: Launch CircadiaOS and begin the onboarding flow to connect your accounts/devices.
4. Connect your wearable: Link your wearable in the app so CircadiaOS can learn your sleep patterns from your sleep data.
5. Connect your thermostat: Link your Nest/Ecobee/Honeywell thermostat in the app so CircadiaOS can control your room temperature automatically (no new hardware required).
6. Verify both connections are active: Confirm in the app that both the wearable and thermostat are successfully linked and communicating.
7. Run the calibration period: Use CircadiaOS nightly for about 14 nights while it calibrates and learns your sleep patterns.
8. Let CircadiaOS optimize automatically: After calibration, allow CircadiaOS to adjust your room temperature each night to align with your body’s natural temperature curve (cooling as you fall asleep, lowest during deep sleep, warming toward wake).
9. Keep using it nightly: Continue sleeping with your wearable and keeping your thermostat connected so CircadiaOS can keep making automatic, nightly temperature adjustments without manual changes.
CircadiaOS FAQs
CircadiaOS is an app that learns how you sleep and automatically adjusts your room temperature each night to help you sleep better.
CircadiaOS Video
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