Herbie Murray
Keep Wi-Fi on during sleep is a setting available on some devices that allows the Wi-Fi chip to remain active even when the device is in a low-power state, such as when the screen is off or the device is asleep. This setting is useful for maintaining an active Wi-Fi connection for apps that require it, such as Wi-Fi calling or auto-downloading apps. However, keeping Wi-Fi on during sleep can have trade-offs in terms of battery life, with potential costs and benefits depending on usage patterns.
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What You'll Learn
- Keeping Wi-Fi on during sleep saves power, but wakes up devices more slowly
- Wi-Fi can be kept on during sleep by adjusting battery settings
- Some apps require a constant Wi-Fi connection, like Wi-Fi calling apps
- A VPN uses memory and CPU for encryption, which can be interrupted by sleep mode
- Keeping Wi-Fi on during sleep is a BIOS function that varies by device
Keeping Wi-Fi on during sleep saves power, but wakes up devices more slowly
Keeping Wi-Fi on during sleep saves power, but wakes devices up more slowly. When the screen is off and no background services are running, a device goes to sleep. During this time, the Wi-Fi chip can enter a low-power state, which saves power. However, there are trade-offs to this approach. When the device wakes up, it will take a fraction of a second longer to turn the Wi-Fi back on, resulting in a less responsive device when the screen is turned on. Similarly, if the device wakes up to perform a background task, such as checking for new emails, it will take slightly longer and use more power.
On Android devices, the "Keep Wi-Fi on during sleep" setting allows the Wi-Fi chip to remain active even when the device is asleep. This setting can be found by navigating to Wi-Fi -> Advanced -> Keep Wi-Fi on during sleep. Keeping Wi-Fi on during sleep can be beneficial for specific applications that require a constant Wi-Fi connection, such as Wi-Fi calling apps (VOIP) or apps that auto-download content exclusively over Wi-Fi.
However, it's important to note that keeping Wi-Fi on during sleep may not be necessary for everyone. If you don't use applications that require a constant Wi-Fi connection, turning off this setting can save battery power. Additionally, if you don't turn on your smartphone frequently within a 24-hour cycle, turning off Wi-Fi during sleep can further conserve battery power.
For those who rely on specific applications with constant Wi-Fi requirements, a possible solution is to enable "Keep Wi-Fi on during sleep" only while the device is plugged into a power source. This approach ensures that the applications remain functional without significantly impacting battery life.
On other devices, such as computers, the behaviour of Wi-Fi during sleep mode can vary. Some systems allow the Wi-Fi chip to remain powered even when the rest of the machine is asleep, but this tends to be a BIOS function. Additionally, keeping a VPN running while the computer sleeps is more complex, as it involves CPU and memory for encryption. As a result, the VPN session data becomes invalid when the CPU wakes up, requiring the CPU to send data at regular intervals to maintain the connection.
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Wi-Fi can be kept on during sleep by adjusting battery settings
Keeping Wi-Fi on during sleep means that your Wi-Fi will always be on, even when your device is asleep. This can be useful if you have apps that require a constant Wi-Fi connection, such as Wi-Fi calling apps (VOIP), apps that auto-download new content, or if you are uploading photos to Google Photos. Keeping Wi-Fi on during sleep can be achieved by adjusting the battery settings on your device.
On Android devices, you can find the relevant settings by going to Wi-Fi -> Advanced -> Keep Wi-Fi on during sleep. When this setting is enabled, the Wi-Fi chip in your device will remain active even when the screen is off and no background services are running. This can save power while the device is asleep, but it comes with some trade-offs. For example, it may take slightly longer for your device to wake up, and background tasks may use more power.
On some smartphones, you may need to adjust the battery settings to keep Wi-Fi on during sleep. For example, on a Huawei P30 Lite, you can go to Settings > Battery > More Battery Settings > Stay Connected While Asleep. This will ensure that your Wi-Fi remains active even when your device is asleep.
Additionally, if you are using a VPN, keeping your Wi-Fi on during sleep can be more complicated. This is because the VPN uses your CPU and memory for encryption, which is usually stopped when the device enters sleep mode. In this case, you may need to use a power-saving option that slows down the CPU clock instead of turning it off completely. Alternatively, you can configure your Wi-Fi and VPN to reconnect automatically when the device boots up, even from a complete shutdown.
In conclusion, keeping Wi-Fi on during sleep can be achieved by adjusting the battery settings on your device. This can be useful for apps that require a constant Wi-Fi connection, but it may come with some trade-offs in terms of power usage and device responsiveness.
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Some apps require a constant Wi-Fi connection, like Wi-Fi calling apps
"Keep Wi-Fi on during sleep" is a setting on Android phones that allows the device to maintain a Wi-Fi connection even when the screen is off and no background services are running. While this setting can save power while the device is asleep, it comes at a cost: when the device wakes up, it will take slightly longer to turn the Wi-Fi back on, resulting in a slight delay in responsiveness. This setting is particularly relevant for apps that require a constant Wi-Fi connection, such as Wi-Fi calling apps.
Wi-Fi calling apps use Voice over Internet Protocol (VoIP) technology to route calls over an internet connection to your mobile service provider's network. This feature is integrated into most modern smartphones and works with your existing phone number. When cellular service is weak or unavailable, Wi-Fi calling automatically connects to your mobile service provider's network via Wi-Fi. This ensures that you can make and receive calls even without a cellular signal.
Major US mobile service providers like AT&T, T-Mobile, and Verizon widely support Wi-Fi calling, but it's important to confirm that it's included in your specific mobile plan. Additionally, some carriers may incur additional charges for making calls over Wi-Fi, so it's always good to check with your mobile service provider. To enable Wi-Fi calling, simply turn on the feature in your phone settings.
There are also several other apps that require a constant Wi-Fi connection. For example, apps that auto-download videos, podcasts, or other content exclusively over Wi-Fi will not function without a constant connection. Similarly, uploading new photos to Google Photos requires an active Wi-Fi connection. For these apps, keeping Wi-Fi on during sleep while the device is plugged into a power source can be a viable solution.
While keeping Wi-Fi on during sleep can be convenient for certain apps, it's important to consider the trade-off between battery life and responsiveness. If battery life is a concern, turning off the "Keep Wi-Fi on during sleep" setting will allow the Wi-Fi chip to go into a low-power state when the device is asleep, saving power. However, this will result in a slight delay when the device wakes up and needs to reconnect to the Wi-Fi network. Ultimately, the decision to keep Wi-Fi on during sleep depends on the user's preferences and the specific requirements of the apps they use.
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A VPN uses memory and CPU for encryption, which can be interrupted by sleep mode
On Android phones, "Keep Wi-Fi on during sleep" means that Wi-Fi will always be on, even when the device is asleep. Keeping Wi-Fi on during sleep saves power when the device is asleep but takes slightly longer to wake the device up, using more power.
Virtual Private Networks (VPNs) use memory and CPU for encryption. Modern computers include a sleep" function that puts the computer in a low-power state, drawing a small amount of power to keep its memory state (RAM) active while cutting power to the processor, storage, and network interfaces. This means that it is not possible to keep a VPN connection active while the computer is asleep.
When a computer goes to sleep, any active VPN connection will be disconnected. For example, on macOS, the computer will automatically sleep when the display turns off, and by default, the display will turn off after several minutes of inactivity. This can be changed in the System Preferences under Energy Saver, where you can also adjust the time until the display turns off. On Windows, you can change the power and sleep settings to adjust when the screen turns off or when the computer sleeps.
Additionally, some VPN clients may experience high CPU usage when waking from sleep due to the constant pinging of VPN servers, which can be concerning in terms of temperature. This can be resolved by disconnecting from the VPN, which instantly drops the CPU usage.
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Keeping Wi-Fi on during sleep is a BIOS function that varies by device
However, keeping Wi-Fi on during sleep comes at a cost. When the device wakes up, it takes slightly longer to become responsive as the Wi-Fi connection is re-established. Additionally, background tasks, such as checking for new emails, may take longer and consume more power. It is worth noting that keeping Wi-Fi on during sleep may not be an option on all devices. For example, some devices may only support certain standby states, and disabling Bluetooth or adjusting power settings might be necessary to maintain the Wi-Fi connection while asleep.
The impact of this setting on battery life is a trade-off. Keeping Wi-Fi on during sleep can save power while the device is asleep, but the process of waking up the device and re-establishing the Wi-Fi connection may use more power. This is similar to the decision between keeping a car engine running or turning it off and using more fuel/battery to restart it later.
To optimise battery life, users can consider their usage patterns. If a smartphone is turned on frequently within a 24-hour cycle, keeping Wi-Fi on during sleep may not provide significant battery savings. On the other hand, if the device remains off for extended periods, turning off Wi-Fi during sleep can help conserve battery power.
Ultimately, the decision to keep Wi-Fi on during sleep depends on individual preferences and the specific requirements of the apps installed on the device. Users should assess their needs and the potential costs and benefits of this setting to make an informed choice.
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Frequently asked questions
This setting allows your device to maintain its Wi-Fi connection even when the screen is off and the device is in a low-power state.
Keeping Wi-Fi on during sleep ensures that apps requiring a constant Wi-Fi connection, such as Wi-Fi calling apps (VOIP), continue to function. It also means that apps that auto-download content over Wi-Fi can do so in the background.
Keeping Wi-Fi on during sleep uses more battery power. Additionally, when the device wakes up, it will take slightly longer to become responsive, as turning the screen on requires an extra fraction of a second to re-enable Wi-Fi.
The steps to enable this setting vary depending on your device. On Android phones, you may find the setting under "Wi-Fi -> Advanced -> Keep Wi-Fi on during sleep." On a Huawei P30 Lite, for example, you would navigate to "Settings -> Battery -> More Battery Settings -> Stay Connected While Asleep."
