Fast NoSleep — keep your PC awake exactly when you need it: block system sleep, and optionally keep the display on, for a set duration or while a process runs. WHY FAST NOSLEEP Long renders, big downloads, compilations, video encoding, backups — one thing can ruin all of them: Windows deciding it is time to sleep. You can change power settings, but that changes behavior for everything, every day. Fast NoSleep is a small, focused tool that does one thing well. A single click keeps your machine awake, and a single click (or a timer, or a process exiting) puts it back to normal. No registry edits, no power plan changes, nothing left behind. The engine behind Fast NoSleep is a native C99 library that calls the Windows SetThreadExecutionState API directly with ES_SYSTEM_REQUIRED. When you also enable keep display on, ES_DISPLAY_REQUIRED is added so the screen stays lit too. It is the same mechanism the operating system expects, so it is reliable and instant — and it is always released when you stop, close, or minimize away from the app. KEY CAPABILITIES ★ One-click keep-awake — start and stop the sleep block in a single tap ★ Three modes — until you stop it, for a set duration, or while a process runs ★ Keep display on — optionally hold the display awake as well as the system ★ Process watch — auto-releases a few seconds after your render, download or build exits ★ Live countdown — see exactly how much keep-awake time is left ★ Persistent settings — your mode, duration and process name are remembered ★ Native engine — pure C99, zero bloat, no companion services ★ Clean release — closing the app always releases the sleep block PERFECT FOR • Video editors and streamers running long renders • Developers with long builds, tests or training jobs • Big downloads, backups and transfers that must not be interrupted • Presentations and demos where a dark screen is not an option • Anyone who keeps fighting Windows sleep at the worst moment MODERN WINDOWS EXPERIENCE Fast NoSleep is a modern Windows app built on WinUI 3, with the same clean card layout, light and dark theme support, and 13-language localization as the rest of the Fast family. Your PC, your schedule, your sleep. Try Fast NoSleep today.