Most Fitbit activity monitors come with built-in sleep monitoring that works automatically — there's no need to tell your Fitbit you're going to bed, as it will just sense it.
Fitbit uses several methods to detect that you're asleep. When you haven't moved in about an hour, it assumes you're asleep, but it confirms this by measuring small movements (like rolling over in your sleep) as well.
If there's a heart rate monitor built into your Fitbit, it combines heart rate and movement data to develop a more accurate picture of your sleep cycle.
Fitbit doesn't just track your overall sleep, but your sleep stages as well. A complete sleep cycle contains several stages, such as light sleep, deep sleep, and REM (rapid eye movement) sleep.
Certain Fitbits estimate these stages using "beat-to-beat changes in your heart rate." This is called heart rate variability (HRV), which is known to vary between light, deep, and REM sleep.
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How to check your Fitbit sleep statistics
After you wake in the morning, you can review the information Fitbit has recorded about your sleep.
Start the Fitbit app on your phone and wait for it to sync. You can see your overall sleep time on the Today page. This is the time Fitbit believes you were asleep the previous evening, not including any time you were restless or woke up during the night.
Tap the sleep entry to go to the detailed Sleep page. At the top of the page, you'll see a graph that shows how you slept for the last week.
Swipe the graph to see three tabs: how long you slept each night, your sleep schedule (the hours you were asleep), and a summary of your sleep stages.
Below the graph is a list of your individual daily sleep cycles. It displays much more detail about your sleep stages throughout the night.
To see this in more detail, tap the day you want to view. On the detailed page, you can also compare your actual sleep to a "benchmark" of how the average person of your age and sex sleeps.
What you can do with Fitbit sleep information
Sleep monitoring is designed to help you assess if you're sleeping a healthy amount, and to improve your sleep.
You can use the information to look for trends, like if you consistently don't get enough sleep, or sleep restlessly and wake up often during a night's sleep.
It's also useful for spotting changes in your sleep. If you usually sleep well but have started to see a change in the quality of your sleep cycles, that might be an indication something is wrong, and you can try to change your sleep habits or have a discussion with your doctor.
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