
Antivirus scans are an important way to ensure that your computer is protected from viruses and malware. However, it can be frustrating when your computer enters sleep mode during a virus scan, especially if you had hoped to wake up to a completed scan. Unfortunately, most virus protection programs require the computer to be active to check for viruses, and none of them will work if your computer is asleep. This is because sleep mode is a power-saving state that only allows a computer to run the most basic functions. While it is possible to change your computer's settings to 'never sleep', this is not ideal for those who want to save energy. Instead, it is recommended that you schedule your scans for a time when you will not be using your device, so you can keep it protected without any inconvenience.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Can antivirus scans run while the computer is asleep? | No |
| Is it a big deal? | No |
| Workaround | Schedule scans for when you won't be using your device intensively or change sleep/power settings to never sleep |
| Can the computer wake up from sleep mode to run a scheduled scan? | Yes, some applications can wake up the computer to run scheduled tasks |
| Can the computer be prevented from entering sleep mode during a scan? | Yes, by changing the sleep/power settings |
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What You'll Learn
- Antivirus scans cannot run while a computer is asleep
- The computer can be set to 'never sleep' to allow scans to run overnight
- Some applications can wake up a computer to run scheduled tasks
- Manual scans are effective, but weekly full scans are recommended
- Cloud-based antiviruses are more lightweight, so scans are less demanding

Antivirus scans cannot run while a computer is asleep
To prevent a computer from entering sleep mode during a virus scan, a user must change the sleep/power settings. This can be done by setting the computer to ''never sleep' or by downloading software such as 'Don't Sleep' to control the sleep function. However, this requires manually changing the settings each time a scan is run, which can be inconvenient.
Some users have reported that their computers enter sleep mode during virus scans, even when the sleep settings are adjusted to accommodate the scan time. This may be due to the computer's power plan settings or the antivirus software's default settings. In such cases, the scan usually resumes immediately when the computer wakes up.
While it is not possible to run antivirus scans while the computer is asleep, this limitation can be easily worked around by scheduling scans for when the device is in active use but not being used intensively, such as during the workday or leisure time. Cloud-based antivirus scans tend to be more lightweight and can be preferred in such cases. Regular scans are essential to maintaining a computer's protection against malware and other threats.
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The computer can be set to 'never sleep' to allow scans to run overnight
To allow your antivirus scans to run overnight without interruption, you can set your computer to never sleep. This is because virus scans cannot run when your computer is in sleep mode.
Windows
To set your Windows computer to never sleep, go to Settings > System > Power & Sleep. Then, select the Sleep options and set them to Never. You can also adjust the On battery option if you want your device to stay awake on battery power.
MacOS
To turn off sleep mode on Mac OS, go to System Preferences > Energy Saver. Then, tick the box next to 'Prevent computer from sleeping automatically when the display is off' and drag the 'Turn display off after' setting to Never.
Third-Party Software
If you want a more automated solution or if adjusting system settings isn’t effective, you can use third-party software to keep your computer awake. Tools like Wakeful, Caffeine, and Insomnia are popular applications that prevent your device from going to sleep. These tools can simulate user activity or override sleep settings, ensuring your system remains active without needing manual adjustments.
Other Considerations
If you use a laptop, make sure it’s plugged in when running scans, as preventing sleep mode while on battery power will drain your battery faster. It's also important to maintain a schedule of routine scans to ensure your computer is always protected. It is recommended to run a full scan at least once a week, and to schedule scans for a time when you aren't using your computer for anything that requires a lot of power or resources.
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Some applications can wake up a computer to run scheduled tasks
While it is not possible to run a virus scan on a computer in sleep mode, some applications can wake up a computer to run scheduled tasks. In Windows 10/11, the Task Scheduler is a free utility that allows users to automate basic tasks, including scheduling an auto-wake-up. To do this, users can go to the Start menu, search for 'Task Scheduler', and select the best match. After clicking on Action and Create Task, users can set a name for the task and select Run whether the user is logged on or not from the Conditions tab.
Users can also specify the frequency of the schedule, such as daily or only once. Additionally, there is a system service called synchapi.h, which includes an API that allows users to set a waitable timer to schedule the PC to turn on after a specified time.
However, it is important to note that some users have reported issues with the Task Scheduler not working as expected. In such cases, it is recommended to manually trigger the task or check the Event Viewer for errors.
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Manual scans are effective, but weekly full scans are recommended
Manual scans are still effective, even if your antivirus software is already running in the background and monitoring the processes on your system. When you first install an antivirus, it will perform a full-system scan to ensure your computer is in a clean state. However, it's possible that there's a dormant virus lurking in an executable file deep on your hard drive that your antivirus missed during its initial scan. In such cases, a manual scan is useful to detect the virus.
Manual scans are also useful when you want to be extra secure with your data. Antivirus software updates regularly via definition files that track the latest malware and viruses. However, it is sometimes possible that a dormant virus or malware is lurking on your computer's hard drive undetected. By regularly using a manual scan to check what's going on, you'll always be on top of the latest definition file updates.
While manual scans are effective, it is also recommended to run a full scan at least once a week. This is because your antivirus software typically offers two types of scans: a quick scan and a deep or full scan. A quick scan quickly looks over the essentials of your PC, checking for anything obvious that's amiss. A full scan, on the other hand, thoroughly checks through your system and places a heavy load on your computer. Therefore, it is best to set aside some time for a full scan, leaving your PC to solely run the deep scan.
It is important to note that you cannot run a virus scan when your device is in sleep mode. Sleep mode is a power-saving state that allows a computer to quickly resume full-power operation. When it's on, your computer can't run anything but the most basic functions. Therefore, it is recommended to schedule your scans for a time when you aren't using your computer for anything that requires a lot of power.
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Cloud-based antiviruses are more lightweight, so scans are less demanding
Cloud-based antiviruses are hosted on remote servers, which means they have a much lighter impact on your device's resources. This is because the cloud servers do the heavy lifting of analyzing data using advanced algorithms, machine learning, and threat intelligence databases. As a result, scans won't slow your device down and are less demanding on your system.
For example, Norton 360 is known to be the lightest cloud antivirus solution on the market. During tests, it was found that the software consumed negligible CPU resources, with usage not exceeding 2% while running a full scan. Similarly, McAfee is another lightweight cloud-based antivirus that achieved a 100% detection rate during tests. It also ran without interrupting other system activities. Bitdefender is another lightweight cloud antivirus that offers top-tier protection.
The lightweight nature of cloud-based antiviruses means that you can run scans in the background without them affecting your device's performance. This is especially useful if you want to run scans while you are away from your device, such as during your sleep. However, it is important to note that if your device enters sleep mode during a scan, the scan will be interrupted and you will need to start over. Therefore, it is recommended to schedule scans for when you are not using your device or are asleep, but ensure your device is set to never enter sleep mode until the scan is complete.
Overall, cloud-based antiviruses offer enhanced protection and efficient performance by leveraging cloud infrastructure and advanced machine learning algorithms. Their lightweight nature makes them ideal for running scans without demanding too much from your device.
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Frequently asked questions
No, you cannot run an antivirus scan when your computer is asleep. Sleep mode is a power-saving state that allows a computer to quickly resume full-power operation. When it’s on, your computer can’t run anything but the most basic of functions.
The scan will either be skipped or postponed until the computer is active again, depending on the antivirus software settings.
You can download "Don't Sleep" to your desktop to control your computer's sleep settings.
It is best to schedule a virus scan when you are not using your computer. This makes it less likely that you will accidentally interfere with the process. It is also important to maintain a schedule of routine scans to ensure your computer is always protected.







































