diff --git a/interface/src/Application.cpp b/interface/src/Application.cpp
index 10850ad0c7..4f3c5e546a 100644
--- a/interface/src/Application.cpp
+++ b/interface/src/Application.cpp
@@ -257,6 +257,10 @@ extern "C" {
 }
 #endif
 
+#ifdef Q_OS_MAC
+#include "MacHelper.h"
+#endif
+
 #if defined(Q_OS_ANDROID)
 #include <android/log.h>
 #include "AndroidHelper.h"
@@ -960,6 +964,9 @@ bool setupEssentials(int& argc, char** argv, bool runningMarkerExisted) {
     DependencyManager::set<KeyboardScriptingInterface>();
     DependencyManager::set<GrabManager>();
     DependencyManager::set<AvatarPackager>();
+#ifdef Q_OS_MAC
+    DependencyManager::set<MacHelper>();
+#endif
 
     QString setBookmarkValue = getCmdOption(argc, constArgv, "--setBookmark");
     if (!setBookmarkValue.isEmpty()) {
@@ -2856,6 +2863,9 @@ Application::~Application() {
     _gameWorkload.shutdown();
 
     DependencyManager::destroy<Preferences>();
+#ifdef Q_OS_MAC
+    DependencyManager::destroy<MacHelper>();
+#endif
 
     _entityClipboard->eraseAllOctreeElements();
     _entityClipboard.reset();
diff --git a/interface/src/MacHelper.cpp b/interface/src/MacHelper.cpp
new file mode 100755
index 0000000000..8527f02918
--- /dev/null
+++ b/interface/src/MacHelper.cpp
@@ -0,0 +1,58 @@
+//
+//  MacHelper.h
+//  interface/src
+//
+//  Created by Howard Stearns
+//  Copyright 2019 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#include "InterfaceLogging.h"
+#include "MacHelper.h"
+#include <NodeList.h>
+
+#ifdef Q_OS_MAC
+#include <IOKit/IOMessage.h>
+#include <IOKit/pwr_mgt/IOPMLib.h>
+
+// The type definitions in these variables come from IOKit, which includes a definition of Duration that conflicts with ours.
+// So... we include these definitions here rather than in the .h, as the .h is included in Application.cpp which
+// uses Duration.
+static io_connect_t  root_port;
+static IONotificationPortRef notifyPortRef;
+static io_object_t notifierObject;
+static void* refCon;
+
+static void sleepHandler(void* refCon, io_service_t service, natural_t messageType, void* messageArgument) {
+    if (messageType == kIOMessageSystemHasPoweredOn) {
+        qCInfo(interfaceapp) << "Waking up from sleep or hybernation.";
+        QMetaObject::invokeMethod(DependencyManager::get<NodeList>().data(), "noteAwakening", Qt::QueuedConnection);
+    }
+}
+#endif
+
+MacHelper::MacHelper() {
+#ifdef Q_OS_MAC
+     root_port = IORegisterForSystemPower(refCon, &notifyPortRef, sleepHandler, &notifierObject);
+     if (root_port == 0) {
+         qCWarning(interfaceapp) << "IORegisterForSystemPower failed";
+         return;
+     }
+     CFRunLoopAddSource(CFRunLoopGetCurrent(),
+                        IONotificationPortGetRunLoopSource(notifyPortRef),
+                        kCFRunLoopCommonModes);
+#endif
+}
+
+MacHelper::~MacHelper() {
+#ifdef Q_OS_MAC
+     CFRunLoopRemoveSource(CFRunLoopGetCurrent(),
+                           IONotificationPortGetRunLoopSource(notifyPortRef),
+                           kCFRunLoopCommonModes);
+     IODeregisterForSystemPower(&notifierObject);
+     IOServiceClose(root_port);
+     IONotificationPortDestroy(notifyPortRef);
+#endif
+}
diff --git a/interface/src/MacHelper.h b/interface/src/MacHelper.h
new file mode 100755
index 0000000000..52ad4d3e55
--- /dev/null
+++ b/interface/src/MacHelper.h
@@ -0,0 +1,21 @@
+//
+//  MacHelper.h
+//  interface/src
+//
+//  Created by Howard Stearns
+//  Copyright 2019 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#pragma once
+
+#include "DependencyManager.h"
+
+class MacHelper : public Dependency {
+public:
+    MacHelper();
+    ~MacHelper();
+};
+