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I can't see my sleep data

Connie D.
Updated

In this article, you’ll learn how sleep data is detected and processed, what to expect after syncing in the morning, and why certain values may be missing. You’ll also find practical tips to avoid missing sleep data and guidance on how to fix common issues with awakenings and syncing.

Good-to-knows

Sleep Detection and Scoring

Sleep data is processed after you wake up, so it may take some time before your results appear in the app. Your sleep data can also be recalculated a few times throughout the day.

Here’s how sleep is detected:

  • The algorithm uses movement and heart rate to detect sleep and wakefulness

  • Lower movement and heart rate signal sleep

  • Higher movement and heart rate signal wakefulness

  • Sleep stages are scored every 30 seconds while you are asleep

  • Once scoring is complete, the data is sent to the app

Because of this process, it’s normal if your sleep data is not available immediately after waking up.

If your sleep time or wake-up time was recorded incorrectly, you can manually edit your sleep to correct it.

What you’ll see after syncing in the morning

When you open the app in the morning, and syncing has completed, you should see:

  • A question banner asking how you slept

  • A sleep duration suggestion that you can confirm, edit, or delete

  • Your sleep data, visible in the Timeline, Overview, and Sleep Summary screens

This is the expected behavior once your data has fully synced.

Missing Sleep HRV in the Overview

To see your Typical Sleep Heart Rate Variability (HRV) value in the Overview, you need:

  • At least 10 days of wear in the last month

If you don’t meet this requirement yet, the value will not appear. 

Read more about metrics availability in this article.

Sleep stages showing “Undefined”

If you see a large portion of Undefined sleep stages in the Sleep Summary, it means the watch did not collect enough reliable data to classify your sleep stages.

This can happen occasionally and is expected. It does not mean your device is malfunctioning.

Awakenings issues

Can’t manually add an awakening

If you’re unable to add an awakening manually, follow these steps:

  1. Go to the Timeline

  2. Tap on a color-filled moon icon at the top of any chart

  3. Tap the pencil icon to log an awakening

  4. Under Awakenings, add one and select an end date and time first

  5. Then select the start date and time

  6. Tap Save

Make sure the time is correct and avoid confusing 12:00 and 00:00, so the awakening is saved under the correct night.

Incorrect long awakening recorded

If the watch recorded a long awakening by mistake, you can edit or remove it:

  1. Go to the Timeline

  2. Tap the color-filled moon icon at the top of any chart

  3. Tap the pencil icon to edit your awakenings

  4. Adjust or delete the awakening as needed

General advice to avoid missing sleep data

If your sleep data isn’t showing, review the checks below.

1. Make sure you wore your NOWATCH overnight

Sleep metrics can only be recorded when the watch is on your wrist, and the sensors stay in contact with your skin.

  • Wear the watch snugly above your wrist bone.

  • Make sure the strap is secure before going to sleep, as it may loosen during the night.

  • Before going to sleep, check that the green LED sensors light up when the watch is on your wrist

2. Check the battery level before sleeping

If the battery runs out overnight, no sleep data can be recorded.

  • Charge your watch before bed.

  • We recommend having at least 30% battery before sleeping.

3. Open the app every morning and allow syncing to complete

If the app hasn’t been opened since you woke up, your sleep data may not have synced yet.

  • Open the NOWATCH app in the morning.

  • Keep the Now screen open until the sync bar at the top finishes.

  • Once syncing is complete, you should see your sleep data in the Timeline, Overview, and Sleep Summary screens.

4. Make sure your watch is connected

Sleep data will only sync if your watch is connected.

  • Look for the green circle at the top of the Now screen

  • Open Device Details and confirm the status shows Connected

  • Check that your NOWATCH appears in your phone’s Bluetooth settings

5. Keep the app running in the background

Avoid fully closing the app before going to sleep. Keeping it open in the background helps maintain stable connectivity and consistent syncing.

6. Check whether the app was closed for too long

NOWATCH can store data for up to 24 hours. If the app isn’t opened within that time, older unsynced data may be overwritten.

To avoid this:

  • Open the app at least once per day.

  • Allow syncing to fully complete.

7. Ensure your app and firmware are up to date

8. If you still have missing sleep data

Contact our Customer Support team and share:

  • A screenshot of your Timeline showing the relevant night and times.

  • A screenshot of your Sleep Summary. To open it:

    • Tap Overview → Asleep (moon icon)

    • Under Sleep Regularity, tap any bar

    • Tap the arrow on the right to open the summary

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