Prevent Sleep Windows Script

PreventSuspend.ps1

# PowerShell Script to Prevent Computer Suspend
# This script keeps the computer awake by using Windows API

Write-Host "=======================================" -ForegroundColor Cyan
Write-Host "  Computer Suspend Prevention Script  " -ForegroundColor Cyan
Write-Host "=======================================" -ForegroundColor Cyan
Write-Host ""
Write-Host "This script will prevent your computer from going to sleep." -ForegroundColor Yellow
Write-Host "Press Ctrl+C to stop the script and allow normal sleep behavior." -ForegroundColor Yellow
Write-Host ""

# Define the SetThreadExecutionState function signature
Add-Type -TypeDefinition @'
using System;
using System.Runtime.InteropServices;

public class PowerManagement
{
    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern uint SetThreadExecutionState(uint esFlags);

    public const uint ES_CONTINUOUS = 0x80000000;
    public const uint ES_SYSTEM_REQUIRED = 0x00000001;
    public const uint ES_DISPLAY_REQUIRED = 0x00000002;
    public const uint ES_AWAYMODE_REQUIRED = 0x00000040;
}
'@

try {
    # Set the execution state to prevent sleep
    # ES_CONTINUOUS | ES_SYSTEM_REQUIRED | ES_DISPLAY_REQUIRED
    # This keeps both the system and display awake
    $result = [PowerManagement]::SetThreadExecutionState(
        [PowerManagement]::ES_CONTINUOUS -bor 
        [PowerManagement]::ES_SYSTEM_REQUIRED -bor 
        [PowerManagement]::ES_DISPLAY_REQUIRED
    )

    if ($result -eq 0) {
        Write-Host "Failed to set execution state. Script may not work properly." -ForegroundColor Red
    } else {
        Write-Host "Suspend prevention activated!" -ForegroundColor Green
        Write-Host ""
        Write-Host "Computer will stay awake while this script is running..." -ForegroundColor Green
        Write-Host ""
        
        # Keep the script running and show a heartbeat every 60 seconds
        $counter = 0
        while ($true) {
            Start-Sleep -Seconds 60
            $counter++
            $timestamp = Get-Date -Format "HH:mm:ss"
            $message = "[$timestamp] Still active... $counter minutes elapsed"
            Write-Host $message -ForegroundColor Gray
        }
    }
}
finally {
    # Reset execution state when script is stopped
    Write-Host ""
    Write-Host "Cleaning up and restoring normal power settings..." -ForegroundColor Yellow
    [PowerManagement]::SetThreadExecutionState([PowerManagement]::ES_CONTINUOUS)
    Write-Host "Normal sleep behavior restored. You can close this window." -ForegroundColor Green
}