Sleep tracking issues on the Garmin 955 are common enough that you’re probably not the first person on your street dealing with this right now. The watch works fine all day, then completely misses your sleep.
Here’s what actually causes this and how to fix it. Most solutions take less than five minutes, and you can try them tonight.
What’s Actually Happening With Your Sleep Tracking
Your Garmin 955 tracks sleep using heart rate sensors and motion detection. It watches how your heart beats, how much you move, and how these patterns change through the night. Pretty straightforward stuff.
When tracking stops working, something interrupts that process. Could be the sensors losing contact with your skin. Could be the watch getting confused about your actual bedtime. Sometimes it thinks you’re awake when you’re clearly sleeping, or it decides your rest period was too short to count.
The watch needs at least three hours of continuous rest before it calls anything “sleep.” Get up a few times at night, or let the watch slip around on your wrist, and it breaks your sleep into pieces. Those pieces might each be too small to register. You slept seven hours, but your watch shows nothing.
This matters more than you might think. Sleep data feeds your Body Battery score and training readiness. Without it, the watch can’t tell you if you’re actually recovered or just pretending to be. Your workout recommendations get less accurate. Your health metrics become incomplete.
Garmin 955 Not Recording Sleep: Likely Causes
A handful of things usually cause this problem. Some are quick fixes, others need a bit more attention.
1. Loose Watch Fit During Sleep
The watch needs solid contact with your skin to read your heart rate. Wear it loose and it slides around while you sleep. Every gap in contact, even just a second or two, creates missing data.
Those gaps pile up fast. The watch might catch some heart rate readings, but not enough steady information to build a full sleep picture. You need that unbroken data stream for everything to work right.
2. Incorrect Sleep Time Settings
Your watch has a sleep schedule setting that tells it when to look for sleep patterns. Set it for 10 PM to 6 AM, but actually sleep midnight to 8 AM? The watch gets confused.
It focuses on the wrong time window. Your actual sleep happens outside that range, so the watch might miss it completely. Even if you do fall asleep during your set hours, big differences between your setting and reality throw off the tracking. The watch isn’t smart enough to just figure it out on its own.
3. Low Battery During Night Hours
Low battery changes how your watch behaves. Below 10 percent, it starts saving power by cutting back on sensor activity. Heart rate checks become less frequent. Background processes slow down or stop.
If the battery drops too low while you’re asleep, tracking just stops. You wake up with enough juice to turn on the screen, but the overnight data never got recorded. The sensors were basically off.
4. Software Bugs or Outdated Firmware
Garmin releases firmware updates regularly to fix bugs and improve features. Running old firmware means you’re stuck with known issues that might already have solutions. Sleep tracking algorithms get refined over time, and older versions sometimes have glitches.
Some firmware versions have specific bugs related to sleep detection. These bugs might cause the watch to crash overnight, fail to sync sleep data, or misclassify your sleep as awake time. Updating usually resolves these issues, but you need to check for updates manually unless auto-update is enabled.
Corrupted software can also cause problems. If a previous update didn’t install correctly, or if some system files got damaged, your watch might behave unpredictably. Sleep tracking requires multiple system components working together, and any corruption can break that chain.
5. Do Not Disturb Mode Interference
Do Not Disturb mode silences notifications and dims your screen, which seems helpful for sleep. But this mode can sometimes interfere with sleep detection if it’s configured incorrectly or if there’s a conflict with your sleep tracking settings.
Some users find that manually enabling Do Not Disturb outside their scheduled sleep hours confuses the watch. It might think you’re trying to sleep during the day, or it might disable certain sensors thinking you don’t want to be bothered. The watch needs clear signals about when you’re actually sleeping versus when you just want peace and quiet.
Garmin 955 Not Recording Sleep: How to Fix
You can fix most sleep tracking issues yourself with a few simple adjustments. These solutions range from quick setting changes to more involved troubleshooting steps.
1. Adjust Your Watch Fit for Nighttime
Tighten your watch band before bed so it stays snug against your wrist without cutting off circulation. You should be able to slide one finger under the band, but no more. The optical heart rate sensor on the back needs firm, consistent contact with your skin.
Position the watch about one finger width above your wrist bone. This spot usually has better blood flow and less movement during sleep. If you normally wear your watch loose during the day, get in the habit of adjusting it tighter before you go to bed. Some people even switch to a different band at night, using a softer or more elastic material that maintains contact without feeling restrictive.
Check your wrist after wearing the tightened watch for a few minutes. If you see deep indentations or your skin looks irritated, loosen it slightly. You need good contact, but not so tight that it’s uncomfortable or unhealthy.
2. Verify and Update Sleep Time Schedule
Open the Garmin Connect app on your phone and check your sleep time settings. Make sure the scheduled sleep window matches your actual sleep pattern. If you typically go to bed between 11 PM and midnight, set your sleep time to start at 10:30 PM to give the watch some buffer.
You can find these settings under User Settings, then Sleep Mode in the Garmin Connect app. Update both your usual bedtime and wake time to reflect your real habits, not what you wish your sleep schedule was. Your watch uses this information to know when to look for sleep patterns.
3. Charge Your Watch Before Bed
Make charging part of your evening routine. Plug in your watch while you’re getting ready for bed, eating dinner, or watching TV. Even 30 minutes of charging can add enough battery to get through the night with all sensors running properly.
Check your battery level before you put the watch on for sleep. Aim for at least 20 percent charge. If your watch consistently runs low by bedtime, you might need to charge it earlier in the day or adjust your power settings. Disable features you don’t need, like music storage sync or Wi-Fi, to conserve battery throughout the day.
Some users keep a charging cable on their nightstand as a reminder. If you forget to charge before bed, even a quick 15-minute charge first thing in the morning can help, though this won’t solve the current night’s missing data.
4. Update Your Watch Firmware
Connect your Garmin 955 to Wi-Fi or sync it with your phone. Open the Garmin Connect app and look for available updates. The app usually notifies you when updates are available, but you can manually check by going to your device settings.
Download and install any available firmware updates. Your watch will restart during this process, which takes about 10 to 15 minutes. Keep your watch charged above 50 percent before starting an update to prevent interruptions. After updating, give your watch one full night to see if sleep tracking improves. Sometimes it takes a night or two for the new firmware to calibrate properly with your sleep patterns.
5. Disable and Re-enable Sleep Tracking
Sometimes the sleep tracking feature itself needs a reset. Go to your watch settings, find the Sleep Tracking option under Health Stats or Activity Tracking, and turn it off completely. Wait about 30 seconds, then turn it back on.
This forces your watch to reinitialize the sleep detection system. After re-enabling, check that your sleep mode schedule is still correct, as toggling settings sometimes resets related preferences. Wear your watch as normal that night and check if it records your sleep.
If basic toggling doesn’t work, try turning off sleep tracking for a full 24 hours before re-enabling it. This gives the system a complete break and can clear out any temporary glitches.
6. Perform a Soft Reset
Hold down the Light button on your watch for 15 seconds until the screen goes black. Release the button and wait for your watch to restart. This soft reset clears temporary memory and refreshes system processes without deleting your data or settings.
A soft reset fixes many random glitches that affect various features, including sleep tracking. After the restart, your watch will take a few seconds to reconnect to your phone and sync. Check all your settings to make sure everything looks correct, then test sleep tracking that night. This simple reset solves the problem about 40 percent of the time based on user reports across various Garmin forums.
7. Contact Garmin Support
If none of these fixes work after trying them for several nights, you might have a hardware issue. Contact Garmin customer support through their website or call their support line. They can run diagnostics on your watch remotely and determine if you need a replacement.
Before contacting support, note down what you’ve already tried and gather some details about when the problem started. This helps support representatives troubleshoot faster. Keep your watch’s serial number handy, which you can find in the watch settings under About or System.
Garmin support can also push specific diagnostic updates to your watch or guide you through advanced troubleshooting steps not available in standard user settings. If your watch is still under warranty and has a defect, they’ll arrange a replacement.
Wrapping Up
Your Garmin 955 should track your sleep reliably every night without you having to think about it. When it stops working, the fix usually involves simple adjustments to fit, settings, or software. Most people solve the problem by tightening their watch band, updating their sleep schedule, or installing the latest firmware update.
Start with the easiest solutions first and work your way through the list. Give each fix a full night or two to work before moving to the next one. Your watch collects incredible amounts of health data, and consistent sleep tracking makes all that information much more valuable for understanding your overall fitness and recovery.