Sauna Score: HRV & Sleep

Name: Sauna Score: HRV & Sleep
Author: Gaialab Inc

Android app by Gaialab Inc. Health & Fitness · Gaialab Inc

Store rating: Unknown
Store rating count: Unknown
Download price: Free to download
In-app purchases: Listed by the store
Version: 1.0.001
Listing last refreshed: 2026-09-18

Store description excerpt

**Did the sauna actually move your numbers?** You sit at 180°F three times a week and watch your HRV wander. Was that the sauna, or last night's dinner? Sauna Score answers that one question. It pulls your HRV, resting heart rate, and sleep from Health Connect and compares the weeks you hit your protocol with the weeks you missed. The Finnish longevity study ran the same comparison across 2,300 men for 20 years (Laukkanen, JAMA Internal Medicine 2015). Here, both groups are you. Works with whatever you already wear: Wear OS watches, Samsung Galaxy Watch, Garmin, Oura, Whoop, Fitbit, Polar. === Pick a protocol. We hold you to it. === Every study behind sauna's reputation measured how often people went. So you pick a cadence and the app tracks whether you keep it. Laukkanen — 4–7×/week, 20 min at 174°F. The longevity default. (JAMA Internal Medicine, 2015) Søberg contrast — 57 min hot + 11 min cold per week, finish cold. (Cell Reports Medicine, 2021) Japanese totonou — the 3-set ritual, for the parasympathetic rebound Beginner ramp — three weeks to get you to Laukkanen === Results by the week === Once a week you get your HRV, resting heart rate, and sleep on target weeks next to off weeks, your eight-week trend, and where you sit against people your age and sex. The honest part: the Finnish numbers are observational, and the controlled trials since have been more guarded. We built the app knowing that. Every figure carries a confidence label (signal probable, below threshold, or needs more data), and when the evidence is thin the app tells you so instead of inventing a trend. === Daily heat readiness === One of three calls each morning: Go hot, Go gentle, or Skip. The call weighs your HRV against your typical week, last night's sleep, your resting heart rate, and the heat you've already banked. There is no score out of 100 and no streak to protect. === Your wearable can't follow you in === A sauna runs 80–95°C. Most wearables are rated to about 35. Even one that survives won't tell you much in there: everyone's pulse races at 100°C, so a high reading just confirms the room is hot. So the app skips in-session readings on purpose. It reads your morning baseline before you go and your overnight recovery after. === End-of-session alarm === Your phone stays outside the cabin. When the timer hits zero it fires a full-volume, heads-up alarm that wakes the screen, loud enough to reach you through the door. === A real sleep score from Health Connect === Every morning, a 0–100 read built from five inputs: Performance (duration), Efficiency (time awake), Restorative (Deep + REM), Bedtime (drift from your 7-night onset median), and Interruptions (awakenings). The targets come from AASM consensus (35% combined Deep + REM; 3–5 awakenings as the normal adult range), not numbers we made up. Sleep data flows in from whichever app on your phone writes to Health Connect: Samsung Health, Fitbit, Google Fit, Oura, Whoop, and others. === Built for people wh

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