diff --git a/code/conquer.cpp b/code/conquer.cpp
index 884efccaf..5d1292736 100644
--- a/code/conquer.cpp
+++ b/code/conquer.cpp
@@ -131,6 +131,7 @@
 
 #include <algorithm>
 #include <array>
+#include <chrono>
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
@@ -141,6 +142,7 @@
 #include <io.h>
 #include <share.h>
 #include <span>
+#include <thread>
 
 
 /****************************************
@@ -959,7 +961,7 @@ bool Map_Edit_Loop(void)
 	Call_Back();								// maintains Theme.AI() for music
 //	Color_Cycle();
 
-	Sleep(1);
+	std::this_thread::sleep_for(std::chrono::milliseconds(1));
 
 	return(!GameActive);
 }
@@ -988,7 +990,7 @@ static void Resize_Tactical_View(bool flag)
 		Rect view(0, 0, Options.ScreenWidth, Options.ScreenHeight);
 		Map.Set_View_Dimensions(view);
 
-		Sleep(2);
+		std::this_thread::sleep_for(std::chrono::milliseconds(2));
 
 	} else {
 
@@ -1001,7 +1003,7 @@ static void Resize_Tactical_View(bool flag)
 		Rect view(0, _tab_height, Options.ScreenWidth-_sidebar_width, Options.ScreenHeight-_tab_height);
 		Map.Set_View_Dimensions(view);
 
-		Sleep(2);
+		std::this_thread::sleep_for(std::chrono::milliseconds(2));
 	}
 }
 
diff --git a/code/except.cpp b/code/except.cpp
index eef6a2e37..7ea614006 100644
--- a/code/except.cpp
+++ b/code/except.cpp
@@ -60,6 +60,7 @@
 #include <tlhelp32.h>
 
 #include <atomic>
+#include <chrono>
 #include <cmath>
 #include <csignal>
 #include <cstdarg>
@@ -68,6 +69,7 @@
 #include <cstring>
 #include <eh.h>
 #include <exception>
+#include <thread>
 
 #define MS_VC_THREAD_NAME_EXCEPTION			0x406D1388
 #define MS_CPP_EXCEPTION					0xE06D7363
@@ -1679,7 +1681,7 @@ static void Save_Machine_State(EXCEPTION_POINTERS * e_info, DWORD self)
 	// The artifacts are safe, and the dumper owns the dialog and the exit from here.
 	for (;;) {
 		SuspendThread(GetCurrentThread());
-		Sleep(1000);
+		std::this_thread::sleep_for(std::chrono::milliseconds(1000));
 	}
 }
 
diff --git a/code/mainloop.cpp b/code/mainloop.cpp
index 083c8b89c..b8cc28733 100644
--- a/code/mainloop.cpp
+++ b/code/mainloop.cpp
@@ -71,6 +71,8 @@
 #include "special.hh"
 
 #include <algorithm>
+#include <chrono>
+#include <thread>
 
 //
 // Special module globals for recording and playback
@@ -173,7 +175,7 @@ static void Check_For_Focus_Loss(void)
 			Windows_Message_Handler();
 			break;
 		}
-		Sleep(10);
+		std::this_thread::sleep_for(std::chrono::milliseconds(10));
 		Windows_Message_Handler();
 	}
 }
@@ -557,7 +559,7 @@ void Sync_Delay(void)
 				TacticalMap->AI();
 				Map.Render();
 			} else {
-				Sleep(0);
+				std::this_thread::yield();
 			}
 			if (!FrameTimer()) {
 				break;
@@ -567,7 +569,11 @@ void Sync_Delay(void)
 		}
 
 		// Out of focus nothing is drawn, so the wait gives the processor back.
-		Sleep(GameInFocus ? 0 : 1);
+		if (GameInFocus) {
+			std::this_thread::yield();
+		} else {
+			std::this_thread::sleep_for(std::chrono::milliseconds(1));
+		}
 	}
 
 	static CDTimerClass<MillisecondSystemTimerClass> fps_timer;
diff --git a/code/msengine.cpp b/code/msengine.cpp
index f5f835255..e7477356d 100644
--- a/code/msengine.cpp
+++ b/code/msengine.cpp
@@ -28,7 +28,9 @@
 #include "color.hh"
 
 #include <algorithm>
+#include <chrono>
 #include <climits>
+#include <thread>
 
 
 /// <summary>
@@ -377,7 +379,7 @@ void MSEngine::Wait_Delay(int delay)
 				timer.Start();
 			}
 
-			Sleep(0);
+			std::this_thread::yield();
 
 		} while (timer.Value() > 0);
 
@@ -406,7 +408,7 @@ void MSEngine::Wait_For_Focus(void)
 
 		while (!GameInFocus) {
 			DebugString("MSEngine - Sleeping\n");
-			Sleep(500);
+			std::this_thread::sleep_for(std::chrono::milliseconds(500));
 			Windows_Message_Handler();
 		}
 
diff --git a/code/netdlg2.cpp b/code/netdlg2.cpp
index 91c359214..7ac735b87 100644
--- a/code/netdlg2.cpp
+++ b/code/netdlg2.cpp
@@ -49,6 +49,7 @@
 #include "wsproto.h"
 
 #include <algorithm>
+#include <thread>
 
 
 /*
@@ -390,7 +391,7 @@ bool Net2Can_Start(void)
 bool Net2_Service_Lobby(void)
 {
 	Ipx.Service();
-	Sleep(0);
+	std::this_thread::yield();
 	Call_Back();
 	Ipx.Service();
 	Title_Screen_Restore();
diff --git a/code/savemgr.cpp b/code/savemgr.cpp
index 9de35b0e9..5bf2a12a0 100644
--- a/code/savemgr.cpp
+++ b/code/savemgr.cpp
@@ -42,8 +42,10 @@
 #include "dialog.hh"
 
 #include <algorithm>
+#include <chrono>
 #include <cstdio>
 #include <string>
+#include <thread>
 #include <vector>
 
 
@@ -602,7 +604,7 @@ void SaveManagerClass::Process_Pending_Load_Game(void)
 		}
 		UI_Service_Game();
 		UIShell.Tick();
-		Sleep(10);
+		std::this_thread::sleep_for(std::chrono::milliseconds(10));
 	}
 
 	box.Hide();
diff --git a/code/score.cpp b/code/score.cpp
index 46b040ed9..16cb9f13d 100644
--- a/code/score.cpp
+++ b/code/score.cpp
@@ -75,6 +75,8 @@
 #include "winstub.h"
 
 #include <algorithm>
+#include <chrono>
+#include <thread>
 
 
 #define SIZEGBAR			140
@@ -1053,7 +1055,7 @@ void ScoreClass::Call_Back_Delay(int time)
 				cd.Start();
 			}
 
-			Sleep(0);
+			std::this_thread::yield();
 
 		} while (cd > 0);
 
@@ -1114,7 +1116,7 @@ void ScoreClass::Timing(void)
 	}
 
 	while (!GameInFocus) {
-		Sleep(500);
+		std::this_thread::sleep_for(std::chrono::milliseconds(500));
 		Windows_Message_Handler();
 	}
 
diff --git a/code/session.cpp b/code/session.cpp
index 0a23d1ed8..970833984 100644
--- a/code/session.cpp
+++ b/code/session.cpp
@@ -78,8 +78,10 @@
 #include "xstraw.h"
 
 #include <algorithm>
+#include <chrono>
 #include <ctime> // for station ID computation
 #include <dos.h> // for station ID computation
+#include <thread>
 #include <winsock.h> // for ntohl
 
 
@@ -1559,7 +1561,7 @@ void SessionClass::Update_Progress(int percent)
 				Call_Back();
 
 				while (Ipx.Global_Num_Send() > 5 && timer > 0) {
-					Sleep(20);
+					std::this_thread::sleep_for(std::chrono::milliseconds(20));
 					Windows_Message_Handler();
 					Call_Back();
 				}
diff --git a/code/startup.cpp b/code/startup.cpp
index c0e51e5d9..bc6ac1fae 100644
--- a/code/startup.cpp
+++ b/code/startup.cpp
@@ -163,9 +163,11 @@
 #include "zbuffer.h"
 
 #include <cfloat>
+#include <chrono>
 #include <lzo/lzoconf.h>
 #include <shellapi.h>
 #include <string>
+#include <thread>
 #include <vector>
 
 extern	HINSTANCE LanguageResources;
@@ -411,7 +413,7 @@ static bool Claim_Single_Instance(void)
 				if (GetLastError () == ERROR_ALREADY_EXISTS) {
 					CloseHandle (AutoPlayMutex);
 					AutoPlayMutex = NULL;
-					Sleep (2500);
+					std::this_thread::sleep_for(std::chrono::milliseconds(2500));
 				} else {
 					DebugString("Create AutoPlayMutex.\n");
 				}
diff --git a/code/taction.cpp b/code/taction.cpp
index b4427474c..b938c4133 100644
--- a/code/taction.cpp
+++ b/code/taction.cpp
@@ -102,8 +102,10 @@
 #include "draw.hh"
 #include "need.hh"
 
+#include <chrono>
 #include <cstdio>
 #include <limits>
+#include <thread>
 
 DynamicVectorClass<TActionClass *> Actions;
 
@@ -2058,7 +2060,7 @@ bool TActionClass::TAction_ZOOM_IN(HouseClass * , ObjectClass * , TriggerClass *
 	Map.Flag_To_Redraw();
 	Map.Render();
 
-	Sleep(1000);
+	std::this_thread::sleep_for(std::chrono::milliseconds(1000));
 	return(true);
 }
 
diff --git a/code/vqa.cpp b/code/vqa.cpp
index 18a401c79..f9e1d95aa 100644
--- a/code/vqa.cpp
+++ b/code/vqa.cpp
@@ -33,6 +33,8 @@
 // lib includes here.
 #include "audio/audiomovie.h"
 
+#include <chrono>
+#include <thread>
 #include <unvq.h>
 #include <vqaplay.h>
 #include <vqaplayp.h>
@@ -520,7 +522,7 @@ int VQAClass::Play_VQA(int last_frame_to_play, bool nobreakout)
 
 		if (sleeping == true) {
 			if (!GameInFocus) {
-				Sleep((1000/30));
+				std::this_thread::sleep_for(std::chrono::milliseconds(1000 / 30));
 				continue;
 			} else {
 				sleeping = false;