NoSleep

A lightweight system tray application that prevents your Windows machine from sleeping or locking.

Features

• System Tray Integration: Runs minimized in the system tray with contextual menu controls
• One-Click Toggle: Double-click the tray icon to start/stop sleep prevention
• Global Hotkey: Press Ctrl+Shift+F9 to toggle sleep prevention from anywhere (configurable)
• Toast Notifications: Modern Windows 10/11 notifications show status changes
• Auto-Start Option: Configure the app to start automatically with Windows (requires admin privileges)
• Auto-Update: Automatic update checking and installation via Velopack
• Visual Status: Different tray icons indicate whether sleep prevention is active or inactive
• Clean Exit: Properly handles Windows shutdown events

What's New in v2.1.2

• 🐛 Menu Bug Fix - Fixed missing menu items when switching between running/stopped states

Previous Releases

v2.1.1

• 🔐 Smart elevation handling - "Startup With Windows" now works seamlessly for all users with automatic UAC prompting and restart
• ⏱️ Uptime display - Tray icon tooltip shows how long sleep prevention has been running (e.g., "Running 2h 15m")
• 📋 Enhanced About dialog - Now displays version number, admin status, and hotkey configuration
• ⌨️ Better hotkey conflict detection - Clear error messages with option to disable when conflicts occur
• 🎨 Cleaner menu - Removed redundant "Restart as Administrator" option

v2.0.0

• ⬆️ Migrated to .NET 8 for better performance and modern C# features
• ⌨️ Added global hotkey support (default: Ctrl+Shift+F9)
• 🔔 Added Windows toast notifications for state changes
• 🔄 Added automatic update system with Velopack
• 🏗️ Refactored codebase with improved architecture (ApplicationContext-based)
• 🐛 Fixed memory leaks and improved resource management

How It Works

The application uses Windows API calls (SetThreadExecutionState) to prevent the system from entering sleep mode. A timer refreshes this state every 60 seconds to ensure continuous operation.

Requirements

• Operating System: Windows 10 version 1809 (build 17763) or later, or Windows 11
• .NET Runtime: .NET 8 (included in installer)
• Administrator Privileges: Automatically requested when needed (e.g., for auto-startup configuration)

Installation & Usage

1. Build the solution or download the release
2. Run NoSleep.exe
3. The application will minimize to your system tray
4. Use the application:
   • Double-click the tray icon to toggle sleep prevention
   • Press Ctrl+Shift+F9 to toggle from anywhere (configurable)
   • Right-click the tray icon to access controls:
     • Start/Stop: Toggle sleep prevention
     • About: View application information, version, and admin status
     • Check for Updates: Manually check for updates
     • Startup With Windows: Configure auto-start (handles elevation automatically if needed)
     • Close: Exit the application

Configuration

Hotkey Settings

The global hotkey can be configured by editing the user settings:

• Default: Ctrl+Shift+F9
• Settings location: %LOCALAPPDATA%\NoSleep\user.config

Notifications

Toast notifications can be disabled in the settings if desired.

Building

dotnet build NoSleep.sln

For release build:

dotnet build NoSleep.sln -c Release