diff --git a/Platform/macOS/Display/VMDisplayWindowController.swift b/Platform/macOS/Display/VMDisplayWindowController.swift
index 0edf9580b..ab380fbf9 100644
--- a/Platform/macOS/Display/VMDisplayWindowController.swift
+++ b/Platform/macOS/Display/VMDisplayWindowController.swift
@@ -14,6 +14,8 @@
 // limitations under the License.
 //
 
+import IOKit.pwr_mgt
+
 class VMDisplayWindowController: NSWindowController {
     
     @IBOutlet weak var displayView: NSView!
@@ -41,6 +43,9 @@ class VMDisplayWindowController: NSWindowController {
     var onClose: ((Notification) -> Void)?
     private(set) var secondaryWindows: [VMDisplayWindowController] = []
     private(set) weak var primaryWindow: VMDisplayWindowController?
+    private var preventIdleSleepAssertion: IOPMAssertionID?
+    
+    @Setting("PreventIdleSleep") private var isPreventIdleSleep: Bool = false
     
     var isSecondary: Bool {
         primaryWindow != nil
@@ -145,6 +150,16 @@ class VMDisplayWindowController: NSWindowController {
         resizeConsoleToolbarItem.isEnabled = true
         windowsToolbarItem.isEnabled = true
         window!.makeFirstResponder(displayView.subviews.first)
+        if isPreventIdleSleep && !isSecondary {
+            var preventIdleSleepAssertion: IOPMAssertionID = .zero
+            let success = IOPMAssertionCreateWithName(kIOPMAssertPreventUserIdleSystemSleep as CFString,
+                                                      IOPMAssertionLevel(kIOPMAssertionLevelOn),
+                                                      "UTM Virtual Machine Running" as CFString,
+                                                      &preventIdleSleepAssertion)
+            if success == kIOReturnSuccess {
+                self.preventIdleSleepAssertion = preventIdleSleepAssertion
+            }
+        }
     }
     
     func enterSuspended(isBusy busy: Bool) {
@@ -173,6 +188,9 @@ class VMDisplayWindowController: NSWindowController {
         usbToolbarItem.isEnabled = false
         windowsToolbarItem.isEnabled = false
         window!.makeFirstResponder(nil)
+        if let preventIdleSleepAssertion = preventIdleSleepAssertion {
+            IOPMAssertionRelease(preventIdleSleepAssertion)
+        }
     }
     
     // MARK: - Alert
@@ -249,6 +267,9 @@ extension VMDisplayWindowController: NSWindowDelegate {
         secondaryWindows.forEach { secondaryWindow in
             secondaryWindow.close()
         }
+        if let preventIdleSleepAssertion = preventIdleSleepAssertion {
+            IOPMAssertionRelease(preventIdleSleepAssertion)
+        }
         onClose?(notification)
     }
     
diff --git a/Platform/macOS/SettingsView.swift b/Platform/macOS/SettingsView.swift
index 966b06f5f..6f152edf0 100644
--- a/Platform/macOS/SettingsView.swift
+++ b/Platform/macOS/SettingsView.swift
@@ -41,6 +41,7 @@ struct ApplicationSettingsView: View {
     @AppStorage("KeepRunningAfterLastWindowClosed") var isKeepRunningAfterLastWindowClosed = false
     @AppStorage("HideDockIcon") var isDockIconHidden = false
     @AppStorage("ShowMenuIcon") var isMenuIconShown = false
+    @AppStorage("PreventIdleSleep") var isPreventIdleSleep = false
     
     var body: some View {
         Form {
@@ -60,6 +61,9 @@ struct ApplicationSettingsView: View {
                     Text("Show menu bar icon")
                 }).disabled(isDockIconHidden)
             }
+            Toggle(isOn: $isPreventIdleSleep, label: {
+                Text("Prevent system from sleeping when any VM is running")
+            })
         }
     }
 }
@@ -143,6 +147,7 @@ extension UserDefaults {
     @objc dynamic var KeepRunningAfterLastWindowClosed: Bool { false }
     @objc dynamic var ShowMenuIcon: Bool { false }
     @objc dynamic var HideDockIcon: Bool { false }
+    @objc dynamic var PreventIdleSleep: Bool { false }
     @objc dynamic var NoCursorCaptureAlert: Bool { false }
     @objc dynamic var DisplayFixed: Bool { false }
     @objc dynamic var CtrlRightClick: Bool { false }
diff --git a/Platform/macOS/VMHeadlessSessionState.swift b/Platform/macOS/VMHeadlessSessionState.swift
index 66fddfe85..3f1f51f2d 100644
--- a/Platform/macOS/VMHeadlessSessionState.swift
+++ b/Platform/macOS/VMHeadlessSessionState.swift
@@ -15,6 +15,7 @@
 //
 
 import Foundation
+import IOKit.pwr_mgt
 
 /// Represents the UI state for a single headless VM session.
 @MainActor class VMHeadlessSessionState: NSObject, ObservableObject {
@@ -26,6 +27,9 @@ import Foundation
     @Published var fatalError: String?
     
     private var hasStarted: Bool = false
+    private var preventIdleSleepAssertion: IOPMAssertionID?
+    
+    @Setting("PreventIdleSleep") private var isPreventIdleSleep: Bool = false
     
     init(for vm: UTMVirtualMachine, onStop: ((Notification) -> Void)?) {
         self.vm = vm
@@ -67,10 +71,23 @@ extension VMHeadlessSessionState: UTMVirtualMachineDelegate {
 extension VMHeadlessSessionState {
     private func didStart() {
         NotificationCenter.default.post(name: .vmSessionCreated, object: nil, userInfo: ["Session": self])
+        if isPreventIdleSleep {
+            var preventIdleSleepAssertion: IOPMAssertionID = .zero
+            let success = IOPMAssertionCreateWithName(kIOPMAssertPreventUserIdleSystemSleep as CFString,
+                                                      IOPMAssertionLevel(kIOPMAssertionLevelOn),
+                                                      "UTM Virtual Machine Background" as CFString,
+                                                      &preventIdleSleepAssertion)
+            if success == kIOReturnSuccess {
+                self.preventIdleSleepAssertion = preventIdleSleepAssertion
+            }
+        }
     }
     
     private func didStop() {
         NotificationCenter.default.post(name: .vmSessionEnded, object: nil, userInfo: ["Session": self])
+        if let preventIdleSleepAssertion = preventIdleSleepAssertion {
+            IOPMAssertionRelease(preventIdleSleepAssertion)
+        }
     }
 }