Don't Sleep – is a small portable program that prevents your computer from going into standby, hibernating, turning off, or restarting.
It also prevents the computer from being logged out, as well as the monitor from being turned off or the screensaver from being turned on.
Of course, you can disable all of the options manually and then re-enable them, but Don't Sleep allows you to save a lot of hand movements and time. It's also easier than ever before.
Aside from that, Don't Sleep has a timer that allows you to unblock or shut down your computer for a set amount of time.
Don't Sleep requires no installation and can be run directly from the desktop or on a small USB stick or other memory device.