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If you’ve noticed your Fitbit sleep score taking a nosedive recently, don’t panic—and definitely don’t assume you’ve unknowingly developed insomnia. It seems Fitbit has quietly rolled out improvements to its sleep tracking technology. And while your numbers might look worse at a glance, you’re actually now getting a much more accurate picture of your sleep patterns.
How your Fitbit tracks your sleep
Your Fitbit Sleep Score is based on heart rate, the time spent awake or restless, and sleep stages. The tracker estimates sleep stages using a combination of movement and heart-rate patterns. For instance, when you haven’t moved for about an hour, your Fitbit assumes you’re asleep.
According to the Fitbit blog, the recent update—which the company addressed only after users complained about it—is “the first step in a series of upcoming improvements” to its tracking technology. The eventual goal is a more precise measurement of your sleep stages. And it turns out, increased precision often results in lower user scores.
Why your sleep score dropped after Fitbit’s update
Here’s what’s happening. If your sleep score dropped from, say, 85 to 78 after the update, it doesn’t mean your sleep quality suddenly deteriorated. Instead, you’re now seeing a more honest assessment that accounts for:
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Brief nighttime awakenings that were previously overlooked
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Lighter sleep periods that might have previously been miscategorized as deep sleep
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Natural sleep fragmentation that occurs in all healthy sleepers
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More precise movement detection that can distinguish between restless sleep and actual wakefulness
Most people experience brief awakenings throughout the night—it’s completely normal and part of healthy sleep architecture. Your brain naturally cycles through different sleep stages, and brief moments of consciousness between these cycles are the norm, not the exception.
The old system essentially gave you a “rosier” picture by overlooking these normal sleep disruptions. While it may have felt good psychologically to see a “good” sleep score, the data you were getting about your actual sleep patterns wasn’t as useful or actionable.
The bottom line
Your Fitbit isn’t trying to make you feel bad about your sleep. A lower sleep score doesn’t mean you’re sleeping worse—it means you’re finally seeing the whole picture.
Don’t bother comparing your new, post-update scores directly to your old ones. Instead, use your post-update scores as your new baseline, and track changes from there. Another helpful tip is to focus on trends rather than an individual night’s readings. One night with a lower score isn’t cause for concern, but consistent changes over weeks might indicate something worth addressing.
And remember: Sleep quality isn’t just about the number on your wearable. How you feel when you wake up, your energy levels throughout the day, and your overall sense of well-being are more important indicators of good sleep.
Fitbit plans to continue iterating on its tracking technology—and perhaps it will reveal more about future changes at the upcoming Made by Google event on Aug. 20.
