When a night is missing, split, or credited to the wrong tracker, one of five rules usually explains it. Work through these checks in order.
011. Check when the sleep ended
Titan assigns a sleep session to the day it ends on, in your phone's local time. The session must end after midnight and no later than 12:00 PM. Sleep that ends after noon counts for no day. A lie-in until 12:30 PM, a daytime sleep after a night shift, and an afternoon nap all fall outside the window, so that day shows no sleep.
022. Check for a gap of more than 2 hours
Titan joins sleep samples into one session when each starts within 2 hours of the previous one ending. A longer gap splits the night in two. When two sessions end on the same morning, Titan keeps the one with more time asleep and drops the other. A 3-hour wake in the night leaves only the longer half in your score.
033. Check your Sleep Tracker and Sleep sources
Tap your avatar on Today to open You, then tap the gear icon to open Settings. Go to Recovery & Sleep > Sleep Tracker. Titan reads your chosen tracker first. On any day your tracker has no session, Titan falls back to every other sleep source. If your chosen tracker no longer appears in Apple Health, Titan reads every source.
A per-metric choice overrides the tracker. Go to Settings > Health & Connected Apps and tap Sleep. If you picked a Primary Source or limited Allowed Sources there, Titan uses only those sources and skips the Sleep Tracker setting. There is no fallback in this case. A night your chosen sources missed stays blank. Tap Reset to All Sources to remove the limit. Choosing your sleep source covers both settings.
044. Read the "Sleep tracked by" line
Tap the Sleep card on Today. Below the score ring, the Sleep screen reads "Sleep tracked by" followed by a source and, when Apple Health has one, a device. The source is the app that wrote the most samples in that session. The device is the one that recorded the most samples. "No sleep recorded" means Titan found no qualifying session for that day.
055. Check Health sharing
Titan reads sleep from Apple Health. Wear your watch to bed, and make sure your sleep app writes sleep to Apple Health. Then go to Settings > Health & Connected Apps > Health Permissions, which opens iOS Settings for Titan, and confirm Sleep is allowed. If Titan cannot read sleep, it shows no sleep. It shows no error. Some trackers write time asleep without stages. Titan still scores those nights, and the Sleep screen lists that time as Unspecified. The health permissions article lists everything Titan reads.
If a night still looks wrong, send the date and the "Sleep tracked by" line through the contact page.
