diff --git a/App/App.csproj b/App/App.csproj
index eb1517e..c514219 100644
--- a/App/App.csproj
+++ b/App/App.csproj
@@ -16,7 +16,7 @@
         <SupportedOSPlatformVersion>10.0.22000.0</SupportedOSPlatformVersion>
         <ApplicationHighDpiMode>PerMonitorV2</ApplicationHighDpiMode>
         <Platforms>AnyCPU;x64;ARM64;x86</Platforms>
-        <PackageVersion>2.1.3</PackageVersion>
+        <PackageVersion>2.1.4</PackageVersion>
         <PackageProjectUrl>https://github.com/soleon/Percentage</PackageProjectUrl>
         <PackageLicenseUrl>https://github.com/soleon/Percentage?tab=MIT-1-ov-file</PackageLicenseUrl>
         <PackageIcon>Icon.png</PackageIcon>
diff --git a/App/App.xaml.cs b/App/App.xaml.cs
index 037884f..59fb44a 100644
--- a/App/App.xaml.cs
+++ b/App/App.xaml.cs
@@ -1,5 +1,5 @@
 using System;
-using System.Linq;
+using System.ComponentModel;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Windows;
@@ -34,6 +34,7 @@ public partial class App
     internal const bool DefaultIsAutoBatteryNormalColour = true;
     internal const int DefaultRefreshSeconds = 60;
     internal const bool DefaultTrayIconFontBold = false;
+    internal const int DefaultTrayIconFontSize = 16;
     internal const bool DefaultTrayIconFontUnderline = false;
     internal const string Id = "f05f920a-c997-4817-84bd-c54d87e40625";
     private static Exception _trayIconUpdateError;
@@ -69,30 +70,11 @@ public App()
         ToastNotificationManagerCompat.OnActivated += OnToastNotificationActivatedAsync;
     }
 
-    internal static MainWindow ActivateMainWindow()
-    {
-        var window = Current.Windows.OfType<MainWindow>().FirstOrDefault();
-        if (window != null)
-        {
-            window.Activate();
-            return window;
-        }
-
-        window = new MainWindow();
-        window.Show();
-        return window;
-    }
-
     internal static Exception GetTrayIconUpdateError()
     {
         return _trayIconUpdateError;
     }
 
-    internal static NotifyIconWindow GetTrayIconWindow()
-    {
-        return Current.Windows.OfType<NotifyIconWindow>().FirstOrDefault();
-    }
-
     private static void HandleException(object exception)
     {
         var version = VersionExtensions.GetAppVersion();
@@ -158,17 +140,15 @@ private void OnToastNotificationActivatedAsync(ToastNotificationActivatedEventAr
     {
         var arguments = ToastArguments.Parse(toastArgs.Argument);
         if (!arguments.TryGetActionArgument(out var action))
-        {
             // When there's no action from toast notification activation, this is most likely triggered by users
             // clicking the entire notification instead of an individual button.
             // Show the details view in this case.
-            Dispatcher.InvokeAsync(() => ActivateMainWindow().NavigateToPage<DetailsPage>());
-        }
-        
+            Dispatcher.InvokeAsync(() => this.ActivateMainWindow().NavigateToPage<DetailsPage>());
+
         switch (action)
         {
             case ToastNotificationExtensions.Action.ViewDetails:
-                Dispatcher.InvokeAsync(() => ActivateMainWindow().NavigateToPage<DetailsPage>());
+                Dispatcher.InvokeAsync(() => this.ActivateMainWindow().NavigateToPage<DetailsPage>());
                 break;
             case ToastNotificationExtensions.Action.DisableBatteryNotification:
                 if (!arguments.TryGetNotificationTypeArgument(out var type)) break;
@@ -188,12 +168,14 @@ private void OnToastNotificationActivatedAsync(ToastNotificationActivatedEventAr
                         break;
                     case ToastNotificationExtensions.NotificationType.None:
                     default:
-                        throw new ArgumentOutOfRangeException(nameof(type), type, $"{type} is not supported.");
+                        throw new InvalidEnumArgumentException(nameof(type), (int)type,
+                            typeof(ToastNotificationExtensions.NotificationType));
                 }
 
                 break;
             default:
-                throw new ArgumentOutOfRangeException(nameof(action), action, $"{action} is not supported.");
+                throw new InvalidEnumArgumentException(nameof(action), (int)action,
+                    typeof(ToastNotificationExtensions.Action));
         }
     }
 }
\ No newline at end of file
diff --git a/App/Extensions/ApplicationExtensions.cs b/App/Extensions/ApplicationExtensions.cs
new file mode 100644
index 0000000..fe56e1d
--- /dev/null
+++ b/App/Extensions/ApplicationExtensions.cs
@@ -0,0 +1,26 @@
+using System.Linq;
+using System.Windows;
+
+namespace Percentage.App.Extensions;
+
+internal static class ApplicationExtensions
+{
+    internal static MainWindow ActivateMainWindow(this Application app)
+    {
+        var window = app.Windows.OfType<MainWindow>().FirstOrDefault();
+        if (window != null)
+        {
+            window.Activate();
+            return window;
+        }
+
+        window = new MainWindow();
+        window.Show();
+        return window;
+    }
+    
+    internal static NotifyIconWindow GetTrayIconWindow(this Application app)
+    {
+        return app.Windows.OfType<NotifyIconWindow>().FirstOrDefault();
+    }
+}
\ No newline at end of file
diff --git a/App/Extensions/ExternalProcessExtensions.cs b/App/Extensions/ExternalProcessExtensions.cs
index b49ee3c..e606c4c 100644
--- a/App/Extensions/ExternalProcessExtensions.cs
+++ b/App/Extensions/ExternalProcessExtensions.cs
@@ -1,7 +1,4 @@
-using System;
-using System.Diagnostics;
-using System.Reflection;
-using Windows.ApplicationModel;
+using System.Diagnostics;
 
 namespace Percentage.App.Extensions;
 
@@ -17,6 +14,11 @@ internal static void OpenFeedbackLocation()
         StartShellExecutedProgress("https://github.com/soleon/Percentage/issues");
     }
 
+    internal static void OpenPowerSettings()
+    {
+        StartShellExecutedProgress("ms-settings:powersleep");
+    }
+
     internal static void OpenSourceCodeLocation()
     {
         StartShellExecutedProgress("https://github.com/soleon/Percentage");
@@ -27,9 +29,15 @@ internal static void ShowRatingView()
         StartShellExecutedProgress("ms-windows-store://review/?ProductId=9PCKT2B7DZMW");
     }
 
-    internal static void OpenPowerSettings()
+    internal static void SleepDevice()
     {
-        StartShellExecutedProgress("ms-settings:powersleep");
+        // Parameter 0,0,0 for "SetSuspendState" native function:
+        // 0: no hibernation
+        // 0: deprecated
+        // 0: allow wake-up events
+        // See documentation for "powerprof":
+        // https://learn.microsoft.com/windows/win32/api/powrprof/nf-powrprof-setsuspendstate
+        Process.Start("rundll32.exe", "powrprof.dll,SetSuspendState 0,0,0");
     }
 
     private static void StartShellExecutedProgress(string fileName)
diff --git a/App/Extensions/NotifyIconExtensions.cs b/App/Extensions/NotifyIconExtensions.cs
index 40a45b6..954bf6f 100644
--- a/App/Extensions/NotifyIconExtensions.cs
+++ b/App/Extensions/NotifyIconExtensions.cs
@@ -9,7 +9,7 @@ namespace Percentage.App.Extensions;
 
 internal static class NotifyIconExtensions
 {
-    private const double NotifyIconSize = 16;
+    private const double DefaultNotifyIconSize = 16;
 
     internal static void SetIcon(this NotifyIcon notifyIcon, FrameworkElement textBlock)
     {
@@ -18,8 +18,8 @@ internal static void SetIcon(this NotifyIcon notifyIcon, FrameworkElement textBl
      
         // Use the desired size to work out the appropriate margin so that the element can be centre aligned in the
         // tray icon's 16-by-16 region.
-        textBlock.Margin = new Thickness((NotifyIconSize - textBlock.DesiredSize.Width) / 2,
-            (NotifyIconSize - textBlock.DesiredSize.Height) / 2, 0, 0);
+        textBlock.Margin = new Thickness((DefaultNotifyIconSize - textBlock.DesiredSize.Width) / 2,
+            (DefaultNotifyIconSize - textBlock.DesiredSize.Height) / 2, 0, 0);
         
         // Measure again for the correct desired size with the margin.
         textBlock.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
@@ -28,14 +28,29 @@ internal static void SetIcon(this NotifyIcon notifyIcon, FrameworkElement textBl
         // Render the element with the correct DPI scale.
         var dpiScale = VisualTreeHelper.GetDpi(textBlock);
         var renderTargetBitmap = new RenderTargetBitmap(
-            (int)Math.Round(NotifyIconSize * dpiScale.DpiScaleX, MidpointRounding.AwayFromZero),
-            (int)Math.Round(NotifyIconSize * dpiScale.DpiScaleY, MidpointRounding.AwayFromZero),
+            (int)Math.Round(DefaultNotifyIconSize * dpiScale.DpiScaleX, MidpointRounding.AwayFromZero),
+            (int)Math.Round(DefaultNotifyIconSize * dpiScale.DpiScaleY, MidpointRounding.AwayFromZero),
             dpiScale.PixelsPerInchX,
             dpiScale.PixelsPerInchY,
             PixelFormats.Default);
         renderTargetBitmap.Render(textBlock);
 
-        notifyIcon.Icon = renderTargetBitmap;
+        // There's a chance that some native exception may be thrown when setting the icon's image.
+        // Catch any exception here and retry a few times then fail silently with logs.
+        for (var i = 0; i < 5; i++)
+            try
+            {
+                notifyIcon.Icon = renderTargetBitmap;
+                App.SetTrayIconUpdateError(null);
+                break;
+            }
+            catch (Exception e)
+            {
+                if (i == 4)
+                    // Retried maximum number of times.
+                    // Log error and continue.
+                    App.SetTrayIconUpdateError(e);
+            }
     }
 
     internal static void SetBatteryFullIcon(this NotifyIcon notifyIcon)
diff --git a/App/NotifyIconWindow.xaml b/App/NotifyIconWindow.xaml
index d2dfdcc..a1eaca1 100644
--- a/App/NotifyIconWindow.xaml
+++ b/App/NotifyIconWindow.xaml
@@ -27,6 +27,10 @@
                              Click="OnSystemSettingsMenuItemClick"
                              Icon="{ui:SymbolIcon Power20}"
                              ToolTip="Open Windows system power and battery settings" />
+                <ui:MenuItem Header="_Sleep device"
+                             ToolTip="Turn your device to sleep mode"
+                             Icon="{ui:SymbolIcon WeatherMoon20}"
+                             Click="OnSleepMenuItemClick" />
                 <ui:MenuItem Header="_About"
                              Click="OnAboutMenuItemClick"
                              Icon="{ui:SymbolIcon Info20}"
diff --git a/App/NotifyIconWindow.xaml.cs b/App/NotifyIconWindow.xaml.cs
index 3bc392d..c6bbd60 100644
--- a/App/NotifyIconWindow.xaml.cs
+++ b/App/NotifyIconWindow.xaml.cs
@@ -45,17 +45,17 @@ public NotifyIconWindow()
 
     private void OnAboutMenuItemClick(object sender, RoutedEventArgs e)
     {
-        App.ActivateMainWindow().NavigateToPage<AboutPage>();
+        Application.Current.ActivateMainWindow().NavigateToPage<AboutPage>();
     }
 
     private void OnAppSettingsMenuItemClick(object sender, RoutedEventArgs e)
     {
-        App.ActivateMainWindow().NavigateToPage<SettingsPage>();
+        Application.Current.ActivateMainWindow().NavigateToPage<SettingsPage>();
     }
 
     private void OnDetailsMenuItemClick(object sender, RoutedEventArgs e)
     {
-        App.ActivateMainWindow().NavigateToPage<DetailsPage>();
+        Application.Current.ActivateMainWindow().NavigateToPage<DetailsPage>();
     }
 
     private void OnExitMenuItemClick(object sender, RoutedEventArgs e)
@@ -67,7 +67,7 @@ private void OnLoaded(object sender, RoutedEventArgs args)
     {
         Visibility = Visibility.Collapsed;
 
-        if (!Default.HideAtStartup) App.ActivateMainWindow().NavigateToPage<DetailsPage>();
+        if (!Default.HideAtStartup) Application.Current.ActivateMainWindow().NavigateToPage<DetailsPage>();
 
         // Debounce all calls to update battery status.
         // This should be the only place that calls the UpdateBatteryStatus method.
@@ -109,7 +109,12 @@ private void OnLoaded(object sender, RoutedEventArgs args)
 
     private void OnNotifyIconLeftDoubleClick(NotifyIcon sender, RoutedEventArgs e)
     {
-        App.ActivateMainWindow().NavigateToPage<DetailsPage>();
+        Application.Current.ActivateMainWindow().NavigateToPage<DetailsPage>();
+    }
+
+    private void OnSleepMenuItemClick(object sender, RoutedEventArgs e)
+    {
+        ExternalProcessExtensions.SleepDevice();
     }
 
     private void OnSystemSettingsMenuItemClick(object sender, RoutedEventArgs e)
@@ -170,22 +175,7 @@ private void SetNotifyIconText(string text, Brush foreground)
 
         if (Default.TrayIconFontUnderline) textBlock.TextDecorations = TextDecorations.Underline;
 
-        // There's a chance that some native exception may be thrown when setting the icon's image.
-        // Catch any exception here and retry a few times then fail silently with logs.
-        for (var i = 0; i < 5; i++)
-            try
-            {
-                NotifyIcon.SetIcon(textBlock);
-                App.SetTrayIconUpdateError(null);
-                break;
-            }
-            catch (Exception e)
-            {
-                if (i == 4)
-                    // Retried maximum number of times.
-                    // Log error and continue.
-                    App.SetTrayIconUpdateError(e);
-            }
+        NotifyIcon.SetIcon(textBlock);
     }
 
     private void UpdateBatteryStatus()
diff --git a/App/Pages/DetailsPage.xaml.cs b/App/Pages/DetailsPage.xaml.cs
index 5a83f05..3a03633 100644
--- a/App/Pages/DetailsPage.xaml.cs
+++ b/App/Pages/DetailsPage.xaml.cs
@@ -1,4 +1,5 @@
 using System.Windows;
+using Percentage.App.Extensions;
 
 namespace Percentage.App.Pages;
 
@@ -12,6 +13,6 @@ public DetailsPage()
     private void OnRefreshButtonClick(object sender, RoutedEventArgs e)
     {
         BatteryInformation.RequestUpdate();
-        App.GetTrayIconWindow().RequestBatteryStatusUpdate();
+        Application.Current.GetTrayIconWindow().RequestBatteryStatusUpdate();
     }
 }
\ No newline at end of file
diff --git a/App/Pages/SettingsPage.xaml.cs b/App/Pages/SettingsPage.xaml.cs
index a3e44e5..6508389 100644
--- a/App/Pages/SettingsPage.xaml.cs
+++ b/App/Pages/SettingsPage.xaml.cs
@@ -117,6 +117,7 @@ private void OnResetButtonClick(object sender, RoutedEventArgs e)
         Default.TrayIconFontFamily = App.DefaultTrayIconFontFamily;
         Default.TrayIconFontBold = App.DefaultTrayIconFontBold;
         Default.TrayIconFontUnderline = App.DefaultTrayIconFontUnderline;
+        Default.TrayIconFontSize = App.DefaultTrayIconFontSize;
         Default.BatteryCriticalNotificationValue = App.DefaultBatteryCriticalNotificationValue;
         Default.BatteryLowNotificationValue = App.DefaultBatteryLowNotificationValue;
         Default.BatteryHighNotificationValue = App.DefaultBatteryHighNotificationValue;
diff --git a/Pack/Package.appxmanifest b/Pack/Package.appxmanifest
index f49d85c..6853644 100644
--- a/Pack/Package.appxmanifest
+++ b/Pack/Package.appxmanifest
@@ -12,7 +12,7 @@
   <Identity
     Name="61867SoleonInnovation.BatteryPercentageIcon"
     Publisher="CN=B0B1FE5B-CC73-4F71-BD3F-7B809647826C"
-    Version="2.1.3.0" />
+    Version="2.1.4.0" />
 
   <Properties>
     <DisplayName>Battery Percentage Icon</DisplayName>