Titan scores each night of sleep from 0 to 100 from three weighted parts. This article covers those parts, the separate Sleep Quality calculation, duration-only nights, the sleep target each screen uses, and the four score bands.
01Where the score appears
The Sleep card on Today shows last night's score. Tap it to open the Sleep screen, which adds the band label, time asleep, restorative sleep percentage, distance from your sleep target, and the device that tracked the night.
Before scoring, Titan decides which night belongs to the day and which source to trust. See how sleep is detected and choosing your sleep source.
02The three parts
Titan scores a night with sleep stages on three parts. Each part earns a result from 0 to 1. Titan multiplies each result by its weight, adds them, and divides by the total weight of 0.68. The last column shows each part's resulting share of the score.
| Part | What it measures | Weight | Share of score |
|---|---|---|---|
| Duration | Time asleep against your sleep target | 0.30 | 44% |
| Restorative sleep | Deep plus REM as a share of time asleep, and the balance between them | 0.24 | 35% |
| Awake time | Time awake as a share of time in bed | 0.14 | 21% |
Titan then raises the blended result to the power 0.9, which lifts middle scores slightly. A blended 50 becomes about 54.
Duration
Titan divides your time asleep by your target and raises the ratio to the power 0.82. Meeting the target earns full credit. Sleeping past it adds nothing. Time in bed spent awake does not count toward duration.
Restorative sleep
Titan treats 40% Deep plus REM as a typical night. Reaching 40% earns full credit on the first piece, which makes up 82% of this part. The remaining 18% rewards an even split between Deep and REM. Equal amounts of each earn full balance credit. A night with REM and no Deep earns none.
Awake time
Titan divides awake time by time in bed and compares it with a cap of 20%. Credit falls as the awake share rises. A night with 5% of time in bed awake keeps about 80% of the credit. At 20% or more, this part scores zero.
A worked example
With an 8 hour target, take a night with 7 hours asleep, 7.5 hours in bed, 30 minutes awake, 1 hour of Deep, and 1.5 hours of REM. Duration earns 0.90, restorative sleep earns 0.88, and awake time earns 0.73. The night scores 87, in the Excellent band.
03The separate Sleep Quality calculation
Interruptions, sleep stress, breathing rate, and blood oxygen do not change the headline Sleep score. Titan puts them in a separate Sleep Quality calculation alongside restorative sleep and awake time.
| Input | How Titan scores it | Weight |
|---|---|---|
| Restorative sleep | Same as the headline score | 0.24 |
| Awake time | Same as the headline score | 0.14 |
| Interruptions | Wake-ups per hour asleep against 2.8, and wake-ups of 5 minutes or longer against 0.8 per hour | 0.10 |
| Sleep stress | Higher stress during the sleep session lowers the result | 0.10 |
| Breathing rate | Distance from your median rate, reaching zero at 22% away | 0.06 |
| Blood oxygen | Zero at 93%, full at 97%, plus a smaller check against your median | 0.06 |
Titan skips any input without a reading and raises the result to the power 0.82. The Sleep screen does not display this score today.
04Nights with duration only
Some trackers record time asleep with no stages. For those nights Titan scores duration alone and applies the same 0.9 power. Meeting your target scores 100. The Restorative sleep figure on the Sleep screen has no value for these nights.
| Time asleep, 8 hour target | Score |
|---|---|
| 4 h | 60 |
| 5 h | 71 |
| 6 h | 81 |
| 7 h | 91 |
| 8 h or more | 100 |
Nothing counts against a duration-only night for low Deep and REM or time awake, so it can outscore a staged night of the same length. If your scores jump after you change sources, check whether the new source records stages.
05Which sleep target each screen uses
Titan keeps two sleep targets, and the screens use different ones.
Today and the Sleep screen score against your Sleep Goal, 8 hours by default. To change it, tap the avatar on Today, tap your profile card on You, and set Sleep Goal under Daily Targets. The range is 4 to 12 hours in half-hour steps.
When Trends recalculates your sleep history, it scores those nights against the Sleep Debt Threshold, 7.5 hours by default. Change it at Settings > Recovery & Sleep > Sleep Preferences > Sleep Debt Threshold. Reach Settings from the avatar on Today, then You > Settings. The range is 5 to 12 hours in half-hour steps. This threshold also sets your nightly need for sleep debt.
Both screens write to the same score history. When the targets differ, a past night's score depends on which screen last recalculated it. A duration-only 7 hour night scores 91 against 8 hours and 95 against 7.5 hours. Changing either target makes Titan rescore past nights against your Sleep Goal. Set both targets to the same value to keep scores consistent.
06Score bands
The band label appears under the ring on the Sleep screen.
| Score | Label | What to work on |
|---|---|---|
| 0 to 49 | Poor | An earlier bedtime, fewer late meals, and a longer sleep window |
| 50 to 69 | Average | Small gains in consistency and duration |
| 70 to 84 | Good | Keep timing consistent and match sleep to your training load |
| 85 to 100 | Excellent | Keep your current routine |
Duration carries 44% of the score and caps at your target, so more time asleep moves a Poor or Average score fastest. To steady your timing, see sleep consistency.
