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Frequently Asked QuestionsLast updated: September 26, 2026
Thank you for using Nemuri. Here are answers to frequently asked questions, and how to contact us.
It helps if you include your iPhone model, your iOS version, your Nemuri version (at the bottom of Settings) and the device you use to track your sleep (such as Apple Watch).
Frequently Asked Questions
My sleep data doesn't show up
Nemuri reads the sleep recorded in the Health app. Wear your Apple Watch to sleep, or set up a sleep schedule in the Health app > Sleep on your iPhone. Also check that reading sleep data is allowed in iPhone Settings > Health > Data Access & Devices > Nemuri. If you don't have an Apple Watch, you can enter your sleep by hand with the + button on the Nights tab.
Why can't I see a comparison yet?
Comparisons start once there are 5 nights with the factor and 5 nights without it, 14 nights in total. Days with nothing logged at all aren't compared, so on days when you had none of your factors, tap “None Today” on the Today tab. Factors imported from Health (such as exercise) can use your past data right away.
I keep seeing “No clear difference”
When your nights vary a lot from day to day, there often isn't enough to say there's a difference. That's an important result too. As you add more nights, the range gets narrower and a pattern may start to show. For a factor you're curious about, try an experiment: pick a period and change that habit.
How is the date of a night decided?
The date 12 hours before you fall asleep is counted as “that night.” (For example, if you fall asleep at 1:00 AM on September 26, it counts as the night of September 25.) Logs from when you wake up until you next fall asleep go into that night. Logs made within 60 minutes after you fall asleep are included too.
My sleep data is counted twice
When more than one app or device writes sleep data, Nemuri uses only one source for each night. You can choose it in Settings > Sleep Data Source.
How is sleep debt calculated?
Nemuri adds up “sleep you need − time asleep that night” over the last 14 nights. A night when you sleep longer pays back up to 120 minutes. Nights without data aren't counted. You can change the amount of sleep you need in Settings.
Can times be shown in 12-hour or 24-hour format?
Yes. Times such as tonight's bedtime, dates and numbers follow your iPhone's region settings. To switch between 12-hour and 24-hour time, go to iPhone Settings > General > Date & Time > 24-Hour Time.
I'm not getting notifications
Turn on notifications in iPhone Settings > Notifications > Nemuri. The tonight's bedtime notification is rescheduled whenever you open the app or your sleep data updates.
What should I do when I get a new iPhone?
Go to Settings > Backup & Export > Export Backup to save your factors, logs, experiments and more in a single file, then import it on your new iPhone. Sleep and other Health data is read again from the Health app.
I bought Plus but can't use it
Try Settings > Restore Purchases. Plus works with the same Apple Account, and for family members through Family Sharing.
Nemuri is a tool for comparing your daily habits with your sleep records. It isn't intended to diagnose or treat any condition, and it shouldn't be used to make medical decisions. If you have symptoms that concern you, talk to a healthcare professional.