We’ve released Sleep Analysis for Android users, designed to provide you with deeper insights into your sleep patterns and their impact on your well-being. Here’s everything you need to know about how it works, what to expect, and where to find your reports.
How sleep data is collected
Welltory syncs your sleep data from your wearable device’s native app. For Android users, this means:
Samsung Health
Fitbit, when integrated via Health Connect
Garmin Connect, when integrated via Health Connect
Please note: there’s currently no option to enter sleep manually through the Welltory app itself. If you want to log sleep by hand, you’ll need to do it directly in your wearable’s native app.
Where to find your Sleep Analysis
Your daily Sleep Analysis is available directly from the Journal in your Welltory app.
Sleep Insights
This section gives you a snapshot of your sleep over the past week, along with a detailed view of last night. Sleep naturally has ups and downs, so don’t get stuck on a single rough night. What matters most is the bigger picture — are you waking up at a steady time, getting enough hours of sleep, staying asleep through the night, and giving your body the recovery it needs?
Sleep Score
Your Sleep Score is an all-in-one measure of how well you’re sleeping. It’s calculated using four key factors: sleep balance, sleep schedule, sleep stability, and heart rate wave.
Sleep Balance
Sleep Balance shows how the time you actually slept (time in bed minus awake periods) compares with the amount of rest your body needs. Too little sleep leaves you drained, but oversleeping isn’t ideal either — finding the right balance is what keeps you feeling your best.
Sleep Schedule
This metric looks at how regular your sleep routine is. The goal is simple: go to bed and wake up at roughly the same time every day. If you’re feeling extra tired, try going to bed earlier — but stick to your usual wake-up time.
Keeping a steady schedule helps your body regulate melatonin, making it easier to fall asleep, sleep soundly, and wake up refreshed. Over time, this consistency supports deeper, more restorative sleep and has a positive impact on your overall health.
Sleep Stability
Sleep Stability reflects how restful your night was by looking at how often and how long you woke up.
It’s normal to wake briefly between sleep cycles, so occasional interruptions aren’t a problem. What matters is frequency and duration: multiple wake-ups lasting 5–12 minutes, or any that stretch beyond 12 minutes, may signal that your sleep is being disrupted.
Heart Rate Wave
Heart Rate Wave is a metric that shows how restorative your sleep was, based on your heart rate patterns.
The chart in this section includes three parts:
Baseline. To calculate it, we need at least 30 nights of Samsung Health, Fitbit, or Garmin Connect data. Your baseline is built from your best recovery nights. If your sleep is usually poor, the baseline won’t be perfect — but it still lets you see whether a given night’s wave is better or worse than your norm. Over time, the baseline adjusts as your recovery patterns change.
Colored dots. These are the heart rate values recorded throughout the night.
Smoothed pulse wave. This line smooths those values into a wave. Its color reflects how the data compares with your baseline.
We look at three main factors:
Wave elevation vs. baseline. This shows whether your heart rate ran higher than usual. Elevated heart rates at night often mean lighter, less restorative sleep with less time in deep stages.
Wave shape. The ideal pattern looks like a hammock: your heart rate dips as melatonin peaks mid-night, then rises again as cortisol prepares you to wake. A different shape may suggest your sleep wasn’t fully restorative.
Heart rate before waking. This indicates how ready your body was to wake up. A lower-than-baseline rate may indicate that you weren’t fully prepared, while a higher rate could suggest an incomplete recovery.
Sleep Stages
We calculate the duration and timing of each sleep stage using our proprietary algorithms, which may result in differences compared to the sleep stages displayed in Samsung Health, Fitbit, Garmin Connect, or other sleep trackers.
Sleep Guidance
This section gives you a personal recommendation — what time you should go to bed today and how much sleep you need.
Your Sleep and Rise Windows shift from day to day based on your routine and how much rest you still need, while also taking your usual schedule into account. If your routine is irregular, the windows get wider to allow for that flexibility.
Still, keeping a steady bedtime and wake-up time pays off. It helps your body regulate melatonin (for sleep) and cortisol (for waking), making it easier to fall asleep, sleep soundly, and start the day refreshed.
Sleep Lake
When you log your sleep manually via Samsung Health, Fitbit, or Garmin Connect, we compare your total sleep time with both your sleep needs and your typical schedule. That’s what forms your Sleep Lake. For deeper insights, try wearing your Samsung Health, Fitbit, or Garmin Connect while you sleep.
If you slept with your device but see Sleep Lake, open your app (Samsung Health, Fitbit, or Garmin Connect) and make sure the data is synced.