- FitnessSyncer Sources
- Activities and Daily Summaries
- Allergies, Medications and Conditions
- Blood Panels
- Blood Pressure
- Body Composition and Bone Density Scans
- Cycle Tracking with FitnessSyncer
- ECG Recordings in FitnessSyncer
- Glucose
- Nutrition and Water
- Blood Oxygen (SpO2)
- Sleep
- Body Temperature
- FitnessSyncer Historic Sync
- Bring Your Past Data to FitnessSyncer
- FitnessSyncer E-mail Source Configuration
- FitnessSyncer Reset Tasks
- FitnessSyncer Filters
- Amazon S3, DropBox, Google Drive, and OneDrive CSV Configuration
- FitnessSyncer Amazon S3, DropBox, Google Drive, and OneDrive File Configuration
- Using FitnessSyncer with GoldenCheetah
- Using FitnessSyncer with Endurain
Sleep
A Sleep item is one sleep, usually a night and sometimes a nap. It holds when you went to bed and when you woke, how long you were asleep, and, where your device recorded them, the stages you went through.
What we record about each night
Every device records sleep a little differently, and we keep what yours sends:
- when you went to bed and when you woke
- how long you were asleep, and how long it took you to fall asleep
- how many times you woke during the night
- how long you spent in each stage of sleep
- your heart rate, heart rate variability, breathing rate and blood oxygen through the night, when your device measures them
A nap is marked as a nap, so it does not count as your night.
Where your sleep data comes from
These services can send your Sleep data to FitnessSyncer:
- Huawei Health
- Whoop
- Withings
- RunKeeper
- Garmin Connect
- Garmin Connect [China]
- Zepp
- Suunto App
- Google Fit
- Sleep as Android
- Oura
- Ultrahuman
- Fitbit
- DropBox (CSV)
- DropBox (Files)
- OneDrive (CSV)
- OneDrive (Files)
- Amazon S3 (CSV)
- Amazon S3 (Files)
- Google Drive (CSV)
- Google Drive (Files)
- E-mail (CSV)
- iHealth
- iHealth (EU)
- Hexoskin
- VitaDock
- Apple Health
- Emfit
- Samsung Health
- Google Health Connect
- Google Health
FitnessSyncer can send your Sleep data to:
- Huawei Health
- RunKeeper
- Google Fit
- TrainingPeaks
- Selfloops
- Runalyze
- Fitbit
- DropBox (CSV)
- DropBox (Files)
- OneDrive (CSV)
- OneDrive (Files)
- Amazon S3 (CSV)
- Amazon S3 (Files)
- Google Drive (CSV)
- Google Drive (Files)
- Intervals.icu
- TrainAsONE
- Apple Health
- Samsung Health
- Google Health Connect
- Google Health
You can also record a night yourself in the FitnessSyncer Notebook, or ask your AI assistant to record it for you.
Reading the sleep graph
Each night’s page in the Stream draws the night from left to right as one band, colored by what you were doing at each moment:
- Really Awake
- Awake
- Restless
- Light Sleep
- REM
- Deep Sleep
- Sleep
The sleep stages are shades of purple, and the deeper the sleep, the darker the shade. Sleep on its own means your device recorded that you were asleep but not which stage, which is all that some devices report. Time awake is teal, and the brighter teal is for a device that tells lying awake apart from being fully awake.
The same colors are used when you compare nights, so a column read down the page means the same thing in every night.
Sleep efficiency
Sleep efficiency is the share of your time in bed that you spent asleep: the time you were asleep, divided by the time from going to bed to waking, as a percentage. Seven hours asleep in eight hours in bed is 87.5%.
Being in bed for eight hours does not mean getting eight hours of sleep, so if that is your goal, a low efficiency says the time is there but the sleep is not. You can experiment with our calculator on our Health and Fitness calculators section.
How do you calculate sleep debt?
We use the formula Sleep Debt = Total Sleep Time - ( Total Awake Time * Ratio of Sleep to Wakefulness ). Like a credit card, a negative number means a debt whereas a positive number implies a credit.
By default, we assume you are sleeping 8 hours a day; you can change this with the Target Sleep Duration in your profile. If sleep is not tracked on a day, we do not use that day in the calculation.
You can experiment with our calculator on our Health and Fitness calculators section.
Seeing your sleep
The Sleep Quality Report charts your hours of sleep, sleep efficiency, sleep debt, heart rate variability, sleeping heart rate, sleep by stage, awakenings and how long you took to fall asleep, and lays your recent nights out one under another. Your sleep duration is shaded against the usual range for your age, which is why your birth date in your Preferences matters here.
Your nights are also on your Calendar, in the Daily Analyzer beside what you did during the day, and you can set a goal for how much you sleep.
Comparing nights
Choose two or more nights in FitnessSyncer Compare to stack their sleep graphs one above the other. Line them up on when you fell asleep, when you went to bed, the clock, or when you woke, and click any part of one night to see what every night was doing at that point. Below the graphs is a table of figures worth comparing, such as how long it took to reach deep and REM sleep and your longest unbroken stretch.
A night’s own page also compares it with the rest of your nights: your deep and REM sleep over the previous 90 days, grouped by when your last workout of the day ended. See Compared with your other entries.
Asking your AI assistant
With the FitnessSyncer MCP Server, an AI assistant can tell you whether you have been getting enough sleep, how consistent your bedtimes have been, which nights were unusually short or restless, and whether you sleep worse after a late workout. It can also record a night for you. See the sample prompts for ideas.
Why does my night show only Sleep and no stages?
Because your device did not report any. Some devices and apps only record when you were asleep and when you were awake, and we show what they sent rather than guessing at stages they did not measure.
