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NoSleep is a lightweight, open-source Windows utility that prevents automatic screen locking, screen saver activation, and system sleep. It adapts to computers using either traditional sleep modes or Modern Standby. Users can enable or disable sleep prevention through a system tray icon. Optional controls keep the display active, prevent sleep when closing a laptop lid, or simulate user activity. Application monitoring automatically activates sleep prevention while selected programs are running. The utility can remember its enabled state and launch automatically with Windows. Built with .NET, NoSleep requires no administrator privileges and consumes minimal system resources.
Features
- Automatic screen lock, screen saver, and system sleep prevention
- Adaptive sleep management supporting classic sleep modes and Modern Standby
- One-click system tray controls with automatic startup and saved preferences
- Application-specific monitoring with automatic sleep prevention activation
- Optional laptop lid sleep blocking with automatic restoration of original settings
- Configurable user activity simulation with invisible input or mouse movement
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