diff --git a/daemon/powerdevilcore.h b/daemon/powerdevilcore.h
--- a/daemon/powerdevilcore.h
+++ b/daemon/powerdevilcore.h
@@ -23,8 +23,9 @@
 
 #include "powerdevilbackendinterface.h"
 
-#include <QStringList>
 #include <QPointer>
+#include <QSet>
+#include <QStringList>
 
 #include <KSharedConfig>
 
@@ -128,7 +129,7 @@
 
     // Idle time management
     QHash< Action*, QList< int > > m_registeredActionTimeouts;
-    QList< Action* > m_pendingResumeFromIdleActions;
+    QSet<Action *> m_pendingResumeFromIdleActions;
     bool m_pendingWakeupEvent;
 
     // Activity inhibition management
diff --git a/daemon/powerdevilcore.cpp b/daemon/powerdevilcore.cpp
--- a/daemon/powerdevilcore.cpp
+++ b/daemon/powerdevilcore.cpp
@@ -702,15 +702,22 @@
 
 void Core::onKIdleTimeoutReached(int identifier, int msec)
 {
+    // Bug 354250: Only trigger actions if we're the currently active session
+    // although we simulate user activity when becoming the active session,
+    // after a user switch we get delivered all pending idle timeouts and may
+    // errorneously send the computer to sleep
+    if (!PolicyAgent::instance()->isSessionActive()) {
+        qCDebug(POWERDEVIL) << "Idle timeout reached but we're not the active session, not triggering actions";
+        return;
+    }
+
     // Find which action(s) requested this idle timeout
-    for (QHash< Action*, QList< int > >::const_iterator i = m_registeredActionTimeouts.constBegin();
-         i != m_registeredActionTimeouts.constEnd(); ++i) {
+    for (auto i = m_registeredActionTimeouts.constBegin(), end = m_registeredActionTimeouts.constEnd(); i != end; ++i) {
         if (i.value().contains(identifier)) {
             i.key()->onIdleTimeout(msec);
+
             // And it will need to be awaken
-            if (!m_pendingResumeFromIdleActions.contains(i.key())) {
-                m_pendingResumeFromIdleActions.append(i.key());
-            }
+            m_pendingResumeFromIdleActions.insert(i.key());
             break;
         }
     }
@@ -761,11 +768,10 @@
 void Core::onResumingFromIdle()
 {
     // Wake up the actions in which an idle action was triggered
-    QList< Action* >::iterator i = m_pendingResumeFromIdleActions.begin();
-    while (i != m_pendingResumeFromIdleActions.end()) {
-        (*i)->onWakeupFromIdle();
-        i = m_pendingResumeFromIdleActions.erase(i);
+    for (auto it = m_pendingResumeFromIdleActions.constBegin(), end = m_pendingResumeFromIdleActions.constEnd(); it != end; ++it) {
+        (*it)->onWakeupFromIdle();
     }
+    m_pendingResumeFromIdleActions.clear();
 }
 
 void Core::onNotificationTimeout()
diff --git a/daemon/powerdevilpolicyagent.h b/daemon/powerdevilpolicyagent.h
--- a/daemon/powerdevilpolicyagent.h
+++ b/daemon/powerdevilpolicyagent.h
@@ -79,6 +79,8 @@
 
     void setupSystemdInhibition();
 
+    bool isSessionActive() const;
+
 public Q_SLOTS:
     // Exported slots
     uint AddInhibition(uint types, const QString &appName, const QString &reason);
diff --git a/daemon/powerdevilpolicyagent.cpp b/daemon/powerdevilpolicyagent.cpp
--- a/daemon/powerdevilpolicyagent.cpp
+++ b/daemon/powerdevilpolicyagent.cpp
@@ -612,4 +612,9 @@
         qCWarning(POWERDEVIL) << "failed to inhibit systemd powersave handling";
 }
 
+bool PolicyAgent::isSessionActive() const
+{
+    return m_wasLastActiveSession;
+}
+
 }