Titan scores each night of sleep from 0 to 100 from three weighted parts. Duration counts most, followed by Deep and REM sleep, then time awake in bed.
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, how far you landed above or below your sleep target, and the app and 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 combined result to the power 0.9, which lifts middle scores slightly. A combined 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.
03Nights without stages
Some trackers record time asleep without stages. The Sleep screen lists that time as Unspecified. It counts toward time asleep and the duration part. The restorative part counts only Deep and REM, so unstaged time earns no restorative credit. Awake time still counts when the tracker records it.
On a day where Titan has a total time asleep but no session detail, it scores duration alone and applies the same 0.9 power. The Restorative sleep figure has no value for those days.
04The sleep target
The Sleep score measures duration against your Sleep Goal, 8 hours by default. To change it, tap your avatar on Today, tap your profile card on You to open Your Profile, and set Sleep Goal under Daily Targets. The range is 4 to 12 hours in half-hour steps. When you change it, Titan rescores your recent sleep history against the new goal.
The Sleep Debt Threshold is a separate setting. It sets your nightly need for sleep debt and does not change the Sleep score.
05Breathing rate and blood oxygen
Breathing rate and blood oxygen do not change the Sleep score. Titan feeds them, along with wake-ups and stress during sleep, into a separate Sleep Quality calculation that the app does not display.
06Score bands
The band label appears under the ring on the Sleep screen.
| Score | Label |
|---|---|
| 0 to 49 | Poor |
| 50 to 69 | Average |
| 70 to 84 | Good |
| 85 to 100 | Excellent |
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.
