Samsung putting apps to sleep? Keep alerts on time with “Never sleeping apps”

Samsung phones sort apps into Sleeping and Deep sleeping lists, and an app on those lists can’t do its work in the background, so its alerts arrive late or only when you open it. Add the app to Never sleeping apps, set its battery use to Unrestricted, and its notifications come on time again.

The tricky part is that you never put the app to sleep yourself. One UI does it quietly, based on how often you open things. A banking app you check twice a month or a school app that only speaks up during exams is exactly the kind of app it decides you don’t need.

What are Sleeping, Deep sleeping and Never sleeping apps?

They are three lists in Samsung’s battery settings that decide how much an app may run when you aren’t using it. Sleeping apps only get to run in the background now and then. Deep sleeping apps don’t run in the background at all and only work while open. Never sleeping apps are left alone. A fourth switch, Put unused apps to sleep, is the one that fills the first two lists automatically.

Why does Samsung put apps to sleep?

Battery life, and a sleep list is a cheap way to get it. The open-source site Don’t kill my app, which tracks how phone makers treat background apps, rates Samsung among the hardest on them. Its Samsung page describes older versions putting any app you hadn’t opened for three days to sleep, which once meant an alarm clock app could miss a Monday morning after a quiet weekend. It also reports something more annoying: even after you take an app off a restricted list, a firmware update or the phone’s own judgement can put it back.

In 2024 Samsung said that from One UI 6 it would follow a common Android policy for apps built to Android’s newer rules, and the same page quotes that promise. That helps apps that are updated for it. It doesn’t remove the sleep lists, and they are still there on recent versions.

How do you add an app to Never sleeping apps?

This takes about two minutes. Do it for the apps that truly need to reach you, such as your main chat app, your bank and anything that acts as an alarm.

1. Open Settings › Battery › Background usage limits. On older One UI it sits under Battery and device care › Battery.
2. Turn off Put unused apps to sleep, so the phone stops adding apps to the sleep lists by itself.
3. Open Sleeping apps and Deep sleeping apps, and remove the app if it is listed.
4. Open Never sleeping apps, tap + (Add apps), tick the app and tap Add.
5. Go to Settings › Apps, pick the same app, tap Battery and choose Unrestricted.

If you’d rather keep Put unused apps to sleep on, because it does save power on apps you forgot about, that’s a fair choice. The Never sleeping list is the part that protects the apps you care about. Just check the list again after big updates.

On some versions you can also keep an app in memory from the recent apps screen: tap the app’s icon at the top of its card and choose Keep open. Not every One UI version has it, so treat it as a bonus.

Should you turn off Adaptive battery?

Many guides tell you to switch off Adaptive battery (Settings › Battery › More battery settings on recent versions). We wouldn’t start there. Adaptive battery works on every app at once, and the per-app fix above usually solves the problem without giving up the saving everywhere else. If one app is still late after it is on the Never sleeping list with Unrestricted battery, then try Adaptive battery off for a few days and see whether it changes anything. If it doesn’t, turn it back on.

One more place worth a look if your alerts only lag while you play games: Samsung’s game tools can hold back notifications during a game. Search Settings for “Game Booster” and check what it blocks.

How do you check that the fix worked?

A quick check first. Lock the phone, then send yourself a message from another phone or from the app’s web version on a computer. It should appear within seconds.

Samsung needs a second, slower test, because sleep lists are about days, not minutes. Leave the app unopened over a weekend, then have someone message you on Monday morning with the screen off. If that arrives on time, the app is properly protected. If it doesn’t, go back to Background usage limits and see whether the app has crept back onto a sleep list.

What if alerts are still late on a Samsung?

Check the plain causes: Do Not Disturb or a Mode that silences the app, a muted chat, or app notifications turned off after an update. If those are fine, you need to see what the phone actually delivered.

Message Alarm keeps an Activity screen that lists every notification it checked, which matched your rules, which rang and why a match didn’t ring (a daily or weekly limit, alarms muted, another alarm already ringing). A message that never appears there was never delivered to Message Alarm in the first place, so the sleep lists are the next suspect. With Smart Tray on, Home also shows a health warning when Android paused Message Alarm for 30 minutes or more, for example “Smart Tray was paused 3 h last night. Android stopped Message Alarm. Nothing was lost.” If you want a record of what came in and when, our guide to notification history on Android covers both the built-in history and saved notifications.

Message Alarm has to follow the same rules as everything else on a Samsung. Its “Fix background issues” card takes you to its battery setting so you can choose Unrestricted. Then add it to Never sleeping apps yourself, the same way as above.

Does this help chat, email and banking apps too?

Yes, the lists don’t care what kind of app it is. Email clients, bank apps, ride apps, smart doorbells and baby monitors all fail the same way on a sleeping list. Other brands have the same problem with different switches: Autostart and Battery saver on Xiaomi (see the Xiaomi fix), background power settings on Vivo, Oppo and Realme (see the Vivo, Oppo and Realme guide), and Phone Master on Infinix and Tecno (see the Infinix and Tecno guide). If you switch phones, expect to repeat this. Every brand ships with its own idea of what you don’t need.

With alerts arriving on time, Message Alarm can turn the important ones into a real alarm that rings even on silent, for messages from people you name or with words you pick, much like an SMS alarm for one sender. It’s free: 2 watched apps, 3 app alarms a day and 15 a week, and 2 auto-replies a week. Smart Tray, Quiet mode, saved and deleted messages, history, spending, bills and the smart features have no limit. There are no ads, and your messages never leave your phone.