Windows has its own default Power Plans to save energy by turning off the display when there isn’t any activity, for a certain time period. It also put your computer to sleep when you don’t touch your keyboard or move your mouse for the set period of time. However, these may be good power saving options, but there are times our computer may be busy, even when we aren’t actively using its keyboard or mouse. For example, when we are streaming some video, watching a movie, or burning a DVD on our PC, we wouldn’t prefer shutting off the display. Some other examples may include downloading large files, taking hard drive backup etc. in these cases, we don’t even want the machine to go to sleep.
While if your Windows 8 has the Group Policy, you can always use it to Prevent all or specific users from shutting down or restarting Windows computer, Don’t Sleep software will make things easier for you.
Prevent Windows from sleeping or shutting down
We can always change the Power Options so that the PC never goes into sleep or standby mode, these settings will remain the same until you change it again. “Don’t Sleep” can help you, by keeping your computer awake for those long-running tasks that need its full attention. This small but powerful application will keep your computer running as long as any small window is open. Using this freeware, you can prevent Windows shutdown.
The main overview of the program shows all. There is a ‘Blocking’ under ‘Preferences’ where you can block – Standby, Hybrid Sleep, Hibernation, Shutdown, Log off and the appearance of the Sreensaver. 
There is also a Timer option given where you can schedule the power options at a specific date and time. From the ‘Option’ tab you can set timer for other functions like. ‘Program set up and Reactivate PC from standby’.
The ‘System’ tab of the program consists of the direct links to Task Manager, System, Power Config, Desktop, Monitor, System Fonts, Screensaver timeout, User accounts, System Configuration and System Information.
You can, anytime, exit and stop blocking, exit and shutdown, exit and aggressive shutdown, exit and standby or hibernation and disable blocking. 
Don’t Sleep comes in a 45KB zip file and needs no installation on your computer system. It uses a very low amount of system resources and is very simple to use even for the novice computer users.
You can minimize the program to your System Tray and use it when required. To sum up, Don’t Sleep is a great application to use when we don’t want our computer system to go in sleep or hibernation mode.
Don’t Sleep software free download
You can download Don’t Sleep for Windows here. Don’t Sleep is a simple and portable software that doesn’t require any installation. You can also transfer the app in your USB device and run it on your other computers.
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