How to read sleep graphs#

The app works behind the scenes to build a 360-degree map of your night. By monitoring movement, environment (noise/light), and vitals from your wearables, we transform invisible signals into actionable insights.

After you stop tracking, the app presents a clear breakdown of your night, in easy-to-read, swipeable cards on Morning briefing. Think of this as your personal sleep dashboard.

Overview: The Morning Screen (Morning Briefing) #

The Morning Briefing (or Morning Screen) is your personal sleep dashboard - the very first screen you see after stopping tracking in the morning. It presents a clear breakdown of your night in easy-to-read, swipeable cards.

What You See First#

When you wake up, check for three signs of healthy sleep:

  • The Sleep Score (0-100%): Your overall recovery grade (aim for 85%+).
  • The Shape: A healthy night looks like a “rollercoaster” - valleys of Deep Sleep transitioning into peaks of Light sleep and REM.
  • Duration & Regularity: Did you hit your time goal? Did you stick to your usual bedtime?

Customizing & Organizing Your Cards#

You can tailor the Morning Screen to show only the information you care about most:

  • Dismiss or Pin: Swipe away cards you don’t need, or long-press a card to pin it to the top.
  • Hide / Show: Use the Hide / Show button at the bottom of the screen to adjust card visibility.
  • Settings Access: Configure default cards at Settings → Personalize → Morning screen.

Morning Briefing Cards Breakdown#

The Sleep Score Card#

The primary card displays your Sleep Score in the top right, supported by colorful progress rings representing health pillars.

  • Filling the Arcs: Think of these as progress rings - the closer the color fills the circle, the closer you are to your optimal goal.
  • Individual Metrics: Each dial focuses on a key pillar (Duration, Deep Sleep, Efficiency, Regularity).
  • Secondary Indicators: Look at the secondary numbers beneath each label for context - such as exact minutes of snoring detected or the gap between actual sleep and your goal.
  • Color coding: Green number indicates a score in the healthy range, while red highlights a score in an unfavorable range.

Need a full breakdown? Read our Sleep Score guide to learn more.

Note: If your Sleep Score card is missing, you may have “Hide stats before rating” enabled in settings.

Subjective Rating & Tags#

While sensors track objective data, Ratings and Tags track your daily life choices:

  • Star Rating: Tap the stars to record how rested you feel upon waking.
  • Lifestyle Tags: Add tags such as #coffee, #stress, or #meds. Over time, the app analyzes these tags to show how lifestyle factors impact sleep quality.

Graph & Sensor Overview Cards#

These cards provide quick visual previews of your detailed night metrics:

  • Hypnogram & Phases Overview: A simplified timeline preview of your sleep depth (Awake, REM, Light, Deep).
  • Actigraph Card: Visualizes physical movement and tossing/turning intensity.
  • Sensor Summary Card: Tracks vitals including Heart Rate (HR), Heart Rate Variability (HRV), Blood Oxygen (SpO2), and Breath Rate.
  • Noise Card: Shows a preview of ambient sound levels recorded during the night.

Utility Cards#

  • Dismiss Alarm: If you wake up before your alarm goes off, dismiss the upcoming alarm directly from this card.
  • Weather Card: Displays current weather conditions via MetNorway or OpenWeather (can be disabled in Settings → Personalize → Morning screen).

Full Graph & Detailed Analysis View#

Tap any graph card on the Morning Briefing to open the Full Graph view. This view overlays all measured signals onto a single high-resolution timeline.

Understanding Graph Layers#

Hypnogram (Sleep Phases)#

Maps your sleep phase progression as a colored timeline:

  • Awake (Lightest Color): Highest columns (100% height).
  • REM & Light Sleep (Medium Color): REM sits at 75% height; Light sleep sits at 50% height.
  • Deep Sleep (Darkest Color): Lowest columns (25% height).

Actigraph (Movement)#

  • High Peaks: Indicate significant physical activity or tossing and turning.
  • Flat Lines: Indicate periods of stillness (typically corresponding to deep sleep).
  • Dashed Line: Indicates the active Smart wake up period.

Sensor Data Lines#

  • Red Line: Heart Rate (HR) in bpm. Red bubbles display maximum and minimum points.
  • Violet Line: Heart Rate Variability (HRV).
  • Blue Line: Blood Oxygen (SpO2) level measured via oximeter.
  • Turquoise Line: Breath Rate measured via Sonar or wearable sensors.
  • Orange Line: Ambient light level measured in LUX.

Noise Graph & Audio Clips#

Tracks volume levels from snoring, sleep talking, or environmental sounds.

  • Listening to Clips: Select an area containing a microphone icon and tap Play in the top-right corner to listen to recorded audio.

Markers and Icons Reference#

Target Graph Icon Description
Actigraph pause Tracking was paused (manually or automatically).
alarm Alarm triggered or was snoozed.
sunrise Local sunrise or sunset event.
snore Snoring detected at this timestamp.
breath alert Low breath rate / potential CPAP event.
battery Phone switched to stand-by due to low battery.
Noise Graph talk Speech/talking detected.
sick Cough or sneeze detected.
baby Baby crying detected.
v Laughter detected.
mic Audio recording available to play.
dream Lucid dreaming cue delivered.

Editing & Refining Graphs#

The Full Graph view also serves as an editing suite:

  • Trim Graph: Adjust start and end times if tracking started too early or was left running.
  • Undo Changes: An Undo banner appears whenever you make edits (up to 5 actions can be reverted). Alternatively, go to ⋮ Menu (in the top right corner of each graph) → Undo.

Full guide for graph editing is available in this section.

Something is not right#

Sleep tracking is a delicate science! If your results seem off, it’s usually because the sensors didn’t get a clear reading.

First Aid#

✔️ Check your setup: Double-check your phone placement to ensure the sensors can accurately track your rest (see infographic here).

👉 Let’s investigate: If the setup looks good but the graph is still weird, we want to help. Send us your application logs in the morning so we can take a closer look: Left ☰ Menu → Support → Report a bug.

If your graph looks unusual, use the table below to identify the issue and find the solution.

What you see Possible Cause How to fix it
Red sections Sensor data were lost Disable optimizations
Flat noise graph Mic access lost Disable optimizations
Duration too long Tracking wasn’t stopped Trim graph
Duration too short Too many awakes Adjust sensitivity or add missing sleep
Missed awakes Low sensitivity Adjust sensitivity

❓ FAQs & Troubleshooting#

What does a "healthy" sleep graph look like?
  • A healthy night of monophasic sleep typically looks like a “rollercoaster” across 7-8 hours.
  • It consists of repeating 90-minute sleep cycles that start with Deep Sleep (valleys at the base) and transition into Light Sleep / REM (peaks towards the top).
Why is my graph showing long periods of "Awake" when I was asleep?
  • Cause A: Active Awake Heuristics. If options like Awake when using phone or Screen on are enabled, picking up or unlocking your phone during the night can mark a period as awake.
  • Cause B: High noise/movement sensitivity. Constant background noise, a running fan, or bed movement from a partner can cause the app to misclassify sleep as wakefulness.
    • Fix: Check your settings under Settings ⚙️ → Sleep tracking → Awake detection or adjust Sensitivity.
What do the colored lines on my detailed sensor graph mean?
  • Red Line: Heart Rate (HR) in beats per minute, with bubbles showing your minimum and maximum HR.
  • Violet Line: Heart Rate Variability (HRV), indicating physical recovery.
  • Blue Line: Blood Oxygen saturation (SpO2) measured via a pulse oximeter.
  • Turquoise Line: Breath Rate measured via Sonar or a connected wearable.
  • Orange Line: Ambient room light measured in LUX.
  • Dashed Vertical Line: Marks the start of your Smart Period window before your alarm.
What are the red sections on my hypnogram?

This is usually caused by aggressive battery management.

  1. Exclude from Optimization: Ensure Sleep as Android is excluded from all forms of battery optimization.
  2. If you are using a connected wearable, check your watch’s companion app (e.g., Pixel Watch app), and Bluetooth services for battery optimization.

For detailed guides, visit DontKillMyApp.com.

How do I listen to sound clips marked on my graph?
  • Look for the mic Microphone icon along the timeline.
  • Drag across the graph to highlight the desired time period, then tap the Play icon in the top right corner to replay the recorded audio snippet.
My sleep start or end time is wrong. Can I fix it?
  • Yes! Tap on any graph card to open the Full Graph / Edit Screen. From there, you can crop or trim the start and end times of your tracking session to reflect when you actually fell asleep or woke up. See full guide at this chapter.
What do the blue O2 bubbles on my graph mean?
  • An O2 icon O2 icon indicates a desaturation event (a temporary drop in blood oxygen levels). Frequent drops contribute to your Respiratory Disturbance Index (RDI), which can be an early indicator of sleep apnea.
Why is one of my sensor lines missing (e.g., HR, HRV, or SpO2)?
  • Sensor lines only appear if a compatible wearable or external device (like a pulse oximeter or chest strap) was connected during tracking, or if Sonar was active for breath tracking. Ensure your wearable is properly paired and configured under Settings → Wearables.

Need further help? Contact us via Left ☰ Menu → Support → Report a bug.

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