initial version, seems to work OK

.gitignore

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+/.vs
+bin
+obj
+*.user
+/WatchSleepBlockers.zip

LICENSE.md

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+Copyright (c) 2020 Michael Rosack ([email protected])
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+WatchSleepBlockers
+==================
+
+A simple .NET Core 3.1 WinForms application to let you know if your computer is doing something that'll prevent it from sleeping.
+
+Emoji from https://openmoji.org/

WatchSleepBlockers.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30621.155
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WatchSleepBlockers", "WatchSleepBlockers\WatchSleepBlockers.csproj", "{3EEB7F63-73E5-4239-8CAA-D7FCDA7BDFFC}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{3EEB7F63-73E5-4239-8CAA-D7FCDA7BDFFC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3EEB7F63-73E5-4239-8CAA-D7FCDA7BDFFC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3EEB7F63-73E5-4239-8CAA-D7FCDA7BDFFC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3EEB7F63-73E5-4239-8CAA-D7FCDA7BDFFC}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {AFD3F70E-CAF1-4735-9226-E885BBADA317}
+	EndGlobalSection
+EndGlobal

WatchSleepBlockers/MainForm.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace WatchSleepBlockers
+{
+    public partial class MainForm : Form
+    {
+        public MainForm()
+        {
+            InitializeComponent();
+            checkPowercfgTimer_Tick(null, null);
+        }
+
+        private void MainForm_Resize(object sender, EventArgs e)
+        {
+            if (this.WindowState == FormWindowState.Minimized)
+            {
+                Hide();
+                trayIcon.Visible = true;
+            }
+        }
+
+        private void trayIcon_MouseClick(object sender, MouseEventArgs e)
+        {
+            Show();
+            this.WindowState = FormWindowState.Normal;
+            trayIcon.Visible = false;
+
+        }
+
+        private async void checkPowercfgTimer_Tick(object sender, EventArgs e)
+        {
+            var requests = await PowercfgRequestParser.GetActiveRequests();
+            Icon icon;
+
+            if (requests.Length == 0)
+            {
+                blockersLabel.Text = "There is nothing preventing this computer from sleeping!";
+                icon = new System.Drawing.Icon("sleeping_emoji.ico");
+            }
+            else
+            {
+                blockersLabel.Text = "The following issues are preventing the computer from sleeping: " + Environment.NewLine + Environment.NewLine;
+                icon = new System.Drawing.Icon("angry_face_with_horns.ico");
+
+                foreach (var request in requests)
+                {
+                    blockersLabel.Text += request + Environment.NewLine;
+                }
+            }
+
+            this.Icon = icon;
+            trayIcon.Icon = icon;
+        }
+    }
+}