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Samsung S21/22 Sleep Mode Not Working After Android 13 Update

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There has been a number of problems on both Samsung Galaxy S21 & S22 after updating the device firmware to Android 13.

What is Sleep mode/Bedtime mode?

Bedtime mode or Sleep mode is a great way to mute calls and notifications when you sleep

According to users, the sleep mode/bedtime mode does not work as they have configured it in settings. For some users, it turns on/off randomly, and for another few users experience, the mode doesn’t automatically turn on/off unless they open the corresponding app of the mode. 

We have searched and tested some solutions with our Galaxy S21/S22 devices. In this guide, we will give you every working solution that you can try for your Galaxy S21/S22 device.

So is the sleep mode not working on your Galaxy S21 or S22 after installing the Android 13 update? Then this is the guide for you!


This guide also applies to other models of Galaxy S21 and S22 (S21+, S21Fe, S21 Ultra, S22+, S22Fe, and S22 Ultra) as well as to Exynos and Snapdragon versions of these devices.

Why does the Sleep mode/Bedtime mode not work after Android 13 update?

It seems like the new android 13 update has carried one or a few bugs making the sleep mode malfunction. While this is the main reason, the Clock app and Background app usage features also have an impact on this sleep/bedtime mode. 

The reason we say that is because when we test the sleep mode feature on our devices, we noticed that sometimes when the clock app is configured differently (more on that in solutions), the sleep mode started to work correctly. The same goes for the background app usage limits feature too.

However, you don’t have to be worried about what is the cause of your case. All you have to do is follow the solutions we have given below. Let’s get into them.

How to fix the sleep mode not working issue on Samsung Galaxy S21/S22

Since you have updated the device firmware to Android 13, everything from here can be applied to Galaxy S21, and S22 and the steps you have to take will be the same. 

Since the sleep mode works to a schedule, you might not be able to rest it after each solution. Therefore, we recommend doing all the solutions we have mentioned below.

Let’s start with clearing the cache.

Fix 01 – Clear the system cache

On Samsung devices, it is recommended to clear the system cache (also known as the cache partition) after installing a software update. 

The reason is, when a new software update is installed, it cannot use the system cache that was built for the previous software version because when the new update starts to use the old cache, various issues can occur on the device.

To clear the system cache, you have to boot your Galaxy S21/S22 into recovery mode. On there you will have the option to clear the system cache. Here are the steps you need to follow;

  1. Turn off the device
  2. To boot your device into recovery mode, plug the USB cable into the device. Then connect the other end to a power source (a charger, Laptop, etc.)
  3. Press and hold the power + volume down keys until the device starts to boot into the recovery mode. You can release the keys once you see the black-and-white menu mode. (If your device doesn’t get booted, release the keys and then press and hold the volume up key)
  4. Use the volume down key and highlight the “Wipe cache partition,” then press the power button
wipe cache partition
  1. To confirm, select Yes and press the power button again
confirm wipe cache
  1. After clearing the system cache is completed, you will see the recovery menu again. Make sure the “Reboot device now” is highlighted and then press the power button to restart your device

Fix 02 – Clear the cache of the clock app

As we said earlier, according to some users and our tests, the clock app on your Galaxy smartphone has an impact on the sleep/bedtime mode. If there is a glitch/bug within the app, clearing its cache should fix the problem.


The system cache is different from the app cache. App cache is stored in a different area while the system cache has a separate partition on your device.

To clear the cache of the Clock app, follow the steps below;

  1. Open Settings
  2. Tap on Apps
  3. Scroll down and find the Clock app, then tap on it
  4. Tap on “Storage”
  5. Then, tap on Clear cache button
clear clock app cache

Note: If you can set up the alarms again, you can even clear its app data which is also located in the Storage section. This should increase the chance of fixing the sleep mode.

Fix 03 – Clear cache of Modes and Routines

The “Modes and Routine” service is what controls the sleep/bedtime mode. So as you cleared the cache of the Clock app, you should clear the cache of this service too.

To do that, follow these steps;

  1. Open Settings and go to Apps
  2. Tap on the filter button and toggle on “Show system apps” option to see system services
  3. Scroll down and tap on “Modes and Routine”
  4. Tap on Storage
  5. Tap on Clear cache

Fix 04 – Check the background usage limits

Background usage limits are a helpful feature to get rid of unwanted apps from eating up your device’s battery. However, you should not let the feature from affecting important apps and services, such as the sleep mode.

Therefore, you have to check if the clock app and Modes and Routine apps/services are in the list of background usage limiting apps.

  1. Open Settings
  2. Tap on Device care
  3. Tap on the Battery section
  4. Then, tap on “Background usage limits”
  5. Here, you should look for the “Clock” app and “Modes and Routines” service. If these two or one of these two are there, tap and hold each app. Then tap on the Remove option.

Fix 05 – Factory data reset

You should not factory reset your device unless you test the Sleep mode. Since you have already done a couple of fixes, the problem should be fixed by now.

Test the sleep mode, and if the problem still persists, follow these steps and do a factory data reset. 

Note: factory data reset permanently delete every personal data on your device. So check this guide and take a backup before doing the factory data reset to avoid data loss

  1. Open Settings
  2. Tap on General management
  3. Tap on Reset
  4. Then, tap on Factory data reset
  5. Enter the lock screen password, if you have set up a screen lock.
  6. Confirm the reset
factory data reset

It will take a few minutes to reset your Galaxy S21/S22, after resetting the device, restore the backup, and see if the problem is solved.

Wrapping Up

According to our research on this problem, Samsung has not yet released a software update addressing this issue. Until then, these solutions should fix the problem.

If you have any questions regarding this guide, leave a comment below. We will be there to help you.

Have a nice day!


The founder of and the tech nerd of the team. He is specialized in Android/iOS development and web development.

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