The Fitbit sleep score is a 0 to 100 rating of last night's sleep, shown in the Sleep tab of the Google Health app, and a good score is 80 or above: Google labels 90 to 100 Excellent, 80 to 89 Good, 60 to 79 Fair and under 60 Poor, with most users averaging between 72 and 83. For years it was built from three parts, duration, quality and restoration; since April 2026 it is built from total sleep duration plus five quality metrics (time to sound sleep, sound sleep, restlessness, interruptions and full awakenings), compared against targets for your age and sex. This page explains both formulas, how sleep stages are detected, what happened to the Premium Sleep Profile animals, why the score sometimes fails to appear, how accurate it is against a sleep lab and what actually moves the number. Apple Watch users should read Apple Watch sleep stages explained instead, since Apple has no native score.
The short version
Aim for 80, expect the 70s, and read the sub-metrics rather than the headline. Duration still carries the majority of the score, so the fastest route to a higher number is more time asleep, not chasing deep sleep. The score, its six sub-metrics and sleep stages are free on every current Fitbit and Pixel Watch, from the $99.95 Inspire 3 and $99.99 Fitbit Air upward; Google Health Premium adds coaching, not the score. Sleep Profile and the monthly animals were retired in May 2026. If you saw your score drop a few points in spring 2026, that was the algorithm change, not your sleep.
Where to find the sleep score in the Google Health app
Since the Fitbit app became the Google Health app on May 19, 2026, sleep has its own tab. Wear the device to bed, sync when you wake, open the app and tap Sleep. Tap Sleep duration and then Score to see last night's number, and use the Sleep duration and Sleep quality chips to switch between the metrics that built it. The week, month and year tabs give the trend, which is where the score earns its keep. On the wrist, Sense 2 and Versa 4 show the score under the duration on the Sleep tile; a Pixel Watch shows it in the Sleep card of its Google Health app; Charge 6, Inspire 3 and other trackers show the most recent session in the daily stats when you swipe up from the clock face. Morning Brief on a Pixel Watch reads it out alongside readiness.
The legacy formula: duration, quality and restoration
From its 2019 launch until April 2026 the Fitbit sleep score was the sum of three components. Sleep duration, worth up to 50 points, was time asleep against your goal and age-based norms. Sleep quality, up to 25 points, rewarded time in deep and REM sleep. Restoration, up to 25 points, looked at sleeping heart rate relative to your daytime resting heart rate and how restless you were; a sleeping heart rate that fell well below your resting rate scored highly. Free users saw the total and the duration and quality parts; the restoration breakdown was Fitbit Premium only. If you are reading an older guide that gives 50/25/25 weights, that is the formula it describes, and it no longer applies.
The 2026 formula: six metrics and what each rewards
Google announced the redesigned sleep score on April 22, 2026, ahead of the Google Health app launch, saying it wanted the score to be more transparent and to reflect how people said they felt about their sleep. Six metrics now contribute, and Google's help page explains what each rewards.
| Metric | What Google measures | What raises the score |
|---|---|---|
| Total sleep duration | Time estimated asleep in your main sleep window; "makes up the majority of the score" | More sleep, up to what your body needs |
| Time to sound sleep | From first trying to sleep until you settle into deep, REM or steady light sleep with a calm heart rate | Settling faster; expected time varies by age and sex |
| Sound sleep | All steady, undisturbed sleep across deep, REM and light stages with low, steady heart rate | A larger share of the night spent soundly asleep |
| Restlessness | Brief stirring or wake-like transitions under five minutes that you would not remember | Less restless time, judged against age, sex and total sleep |
| Interruptions | Total time fully awake in stretches longer than five minutes between falling asleep and final waking | Less awake time overall |
| Full awakenings | Count of distinct awakenings longer than five minutes, excluding time falling asleep or lingering in bed | Fewer; zero is ideal, under two is good for most people |
Two ideas underpin the change. The five-minute threshold separates "awake", which you would remember and which disrupts recovery, from "restlessness", the normal brief transitions between stages. And "sound sleep" replaces the old fixation on deep sleep: Google now counts steady light sleep with a calm heart rate as restorative, on the basis that if it woke you during sound sleep you would know you had been asleep. Google warned that existing users might see scores drop several points during the transition and stressed that the benchmarks had not moved: 80 and above still means a good night. There is no way to switch back to the old score.
Score bands and what they mean
Google categorises scores by how users typically rate their own sleep quality: Excellent 90 to 100, Good 80 to 89, Fair 60 to 79, Poor below 60. With most users averaging 72 to 83, the honest reading of "what is a good sleep score on Fitbit" is that a consistent low 80s is very good, the high 70s is normal, and Excellent nights are rare because they require long duration, quick settling and almost no awakenings at once. A score in the 50s after a broken night is doing its job. Google's own advice is to focus on your personal best and your trend rather than the global figure or a perfect 100, and to trust how you feel over the number when the two disagree. For how rival apps grade the same night, the ring and watch options are compared in the best sleep score apps.
Fitbit sleep stages: light, deep, REM and awake
The score depends on sleep stages, and stages depend on heart rate. Fitbit combines movement from the accelerometer with beat-to-beat heart-rate patterns to estimate when you are awake, in light sleep, in deep sleep or in REM. Google's guidance is that a sleep of roughly three hours or more with continuous heart-rate data is needed; shorter naps get a duration and a simple asleep/awake split but no stages and no score. Every current Fitbit and Pixel Watch with an optical heart-rate sensor produces stages, including the Inspire 3, Charge 6, Versa 4, Sense 2, Pixel Watch 4 and 5 and the screenless Fitbit Air; which is cheapest is covered in the cheapest Fitbit in 2026.
In the Sleep tab the stages appear as a hypnogram with the percentage of the night in each. Typical adult proportions from Fitbit's own population data are roughly half the night in light sleep, 10 to 25 percent in deep and 20 to 25 percent in REM, with deep sleep concentrated early and REM late. Deep sleep declines with age, which is normal rather than a fault to fix. The 2026 redesign also removed Sleep Sensitivity settings, the Estimated Oxygen Variation graph and, on Sense and Versa 3, snore detection; SpO2 is still tracked on the Health tab under Vitals.
Sleep Profile animals and Premium in 2026
Sleep Profile launched in June 2022 as a Fitbit Premium feature. After at least 14 nights of tracking in a month it analysed ten longer-term metrics and, on the first of the next month, assigned one of six animals: bear, dolphin, giraffe, hedgehog, parrot or tortoise, with the giraffe (short, deep, early-waking) the most common and the dolphin (light, short, often awake) the rarest by Fitbit's 2023 figures. Google did not carry it into the Google Health app. Its May 2026 notes state that Sleep Profile "will no longer be available and you won't receive monthly sleep animals"; Premium users are told to ask the Health Coach what type of sleeper they are instead. Historical Sleep Profile data was downloadable until July 15, 2026. So the Premium position for sleep in 2026 is: the score, sub-metrics and stages are free in the Base tier; Google Health Premium at $9.99 a month or $99.99 a year (£8.99 or £89.99 in the UK) adds Personalised Insights, Targeted insights such as a suggestion to put the phone down earlier if time to sound sleep is consistently high, and the Gemini-based Health Coach, which Google itself cautioned at launch could give inaccurate details about sleep sub-metrics while a fix rolled out.
Why your Fitbit sleep score is missing
Google's help page is direct: to get a sleep score you need sleep stages, and if you did not get stages you will not get a score. The causes are the ones that break staging. The sleep was too short, under about three hours. The heart-rate signal dropped out because the band was loose, worn over a bone or on a tattoo, or the device was switched to a low-power setting. The battery died mid-night, ending the session early. You logged the sleep manually, which never produces a score. You edited the sleep log to extend it, which Google warns can leave gaps in stages and may produce no score or an unreliable one. Or the sync has not finished: the score can take a minute to appear after syncing. If steps and workouts are also missing, the problem is the connection rather than sleep, and how to add steps to Fitbit covers the Health Connect and Apple Health checks.
Accuracy versus a sleep lab
Polysomnography, the lab standard, scores sleep from brain waves, eye movement and muscle tone; a wrist tracker infers it from movement and heart rate, so it cannot match a lab and Google does not claim it does. Fitbit's own researchers published the most-cited validation in 2017 (Beattie and colleagues, Physiological Measurement): across 60 adults the Fitbit algorithm agreed with polysomnography on wake, light, deep and REM about 69 percent of the time epoch by epoch, with good total-sleep-time estimates and a known weakness in distinguishing light sleep from quiet wakefulness. That weakness is why wrist devices tend to over-estimate sleep and under-count time awake, and why the 2026 five-minute wake threshold matters. Google says its latest algorithm improved stage accuracy against gold-standard measurements across all compatible Pixel and Fitbit devices, but had not published the figures at publication. The practical conclusion holds for Fitbit as for the rings compared in the best sleep tracking rings: total sleep time and night-to-night trend are trustworthy; the exact minutes of deep sleep are not.
Quick fixes that actually move the score
Because duration carries the majority of the score, the single biggest lever is going to bed earlier, not a supplement or a cooler room, useful as those may be. Second is a consistent schedule, including days off, which shortens time to sound sleep and reduces restlessness. Third is what Google lists under sleep-healthy habits: being active in the day, limiting alcohol, caffeine and nicotine, and a wind-down routine. Alcohol in particular lengthens time to sound sleep and increases restlessness and full awakenings in the second half of the night, so it hits three of the six metrics at once. Check the sub-metrics before changing anything: if your interruptions are near zero and duration is short, you have a bedtime problem; if duration is fine and restlessness is high, look at the room, late meals and alcohol. Fitcoin, our own app, reads the sleep your Fitbit writes to Apple Health or Health Connect alongside your workouts and steps to build a daily FitScore and weekly Leagues, so a better night shows up in the same place as your training. The score is a wellness estimate; persistent Poor nights with daytime sleepiness or snoring are a reason to talk to a doctor, not to buy a different tracker. If you are weighing a watch-based option instead, the best sleep score apps for Apple Watch covers that side.
Frequently asked questions
What is a good sleep score on Fitbit?
Google's bands are Excellent for 90 to 100, Good for 80 to 89, Fair for 60 to 79 and Poor for anything under 60. Google says most users average between 72 and 83, so a night in the low 80s is genuinely good and a 90 is unusual. After the April 2026 algorithm change Google confirmed the benchmarks did not move: 80 or above still means you used your sleep window well. Judge your own trend rather than the global average.
Why is my Fitbit sleep score not showing?
A sleep score needs sleep stages, and stages need roughly three hours of sleep with continuous heart-rate data. Naps, very restless nights, a loose band, a dead battery or taking the device off before you wake all leave a duration but no score. Manually logged sleep never gets a score. After syncing, the score can take a minute to appear; if it still does not, check that heart-rate tracking is on and the device is on Google's sleep-stages compatibility list.
Does the Fitbit sleep score need Premium in 2026?
No. The sleep score, its six sub-metrics and sleep stages are in the free Base tier of the Google Health app on every compatible Fitbit and Pixel Watch. Google Health Premium ($9.99 a month or $99.99 a year) adds personalised insights, targeted tips and the Gemini-based Health Coach for sleep questions. The Premium-only Sleep Profile and its monthly animals were retired when the Google Health app launched in May 2026; the old Premium restoration breakdown has also gone, replaced by the free sub-metrics.
How accurate is the Fitbit sleep score?
The score is derived from sleep staging, and Fitbit's own peer-reviewed 2017 validation found roughly 69 percent epoch-by-epoch agreement with polysomnography across wake, light, deep and REM. Wrist trackers are good at total sleep time and poor at telling light sleep from quiet wakefulness, so they tend to over-count sleep and under-count wake. Google says the 2026 algorithm improved stage accuracy against clinical measurements but has not published figures at publication. Treat the score as a consistent trend line, not a lab result.
Method: Checked September 8, 2026 using Google Health help pages on the sleep score, sleep stages and Morning Brief, Google's May 2026 notes on the redesigned Google Health app, Google's Fitbit blog posts on Sleep Profile, the 2017 Beattie et al. validation study in Physiological Measurement, and coverage of the April 2026 sleep score redesign from 9to5Google, Android Police and Gadgets & Wearables. Legacy component weights are as documented in Fitbit's pre-2026 help pages. Prices are US list at publication with UK prices where confirmed. Fitcoin has no commercial relationship with Google, Fitbit, Apple, Oura or any hardware brand named here. Wellness estimates only, not medical advice.
About the author: Harris Khan is the co-founder and CTO of Fitcoin, a UK fitness-rewards app.