2 October 2021
Updated Context Menu to stop timer after certain interval, made default to stop after 2 hours. Also updated to use .Net Framework 4.8
13 July 2016
NoSleep utility prevents Windows OS from automatically going into ScreenSaver / Sleep / ScreenLock modes. It's meant for those cases where user cannot change settings (due to corporate-enforced policy, for example). Inspired by Linux Caffeine.
Download NoSleep.exe from "Compiled binary" folder. Then just run and forget. You can also add shortcut to NoSleep to your StartUp items for NoSleep to start on user login. While active NoSleep will sit in Windows tray and prevent Windows from blocking.
If you wish to stop it - close the program - right-click tray icon and select "Close".
.NET 4.0 (client profile)
NoSleep works through calling to SetThreadExecutionState resetting display/idle Windows timers every 10 seconds. Should use no CPU and around 6-7 MBs of RAM. Icons are taking up 166 KB in compiled binary, the rest is the code (~10 KB).
Icon was taken from http://www.iconarchive.com/show/food-icons-by-martin-berube/coffee-icon.html. Icon is disributed as freeware.
Artist: Martin Berube (thanks, Martin!)
Completely free, use as you will. No liability.