diff --git a/wagtail/wagtailadmin/views/pages.py b/wagtail/wagtailadmin/views/pages.py
index 001df53ee..d678e1736 100644
--- a/wagtail/wagtailadmin/views/pages.py
+++ b/wagtail/wagtailadmin/views/pages.py
@@ -20,7 +20,6 @@ from wagtail.wagtailadmin import tasks, signals
 
 from wagtail.wagtailcore import hooks
 from wagtail.wagtailcore.models import Page, PageRevision, get_navigation_menu_items
-from wagtail.wagtailcore.signals import page_unpublished
 
 
 @permission_required('wagtailadmin.access_admin')
@@ -364,18 +363,12 @@ def delete(request, page_id):
 
     if request.POST:
         if page.live:
-            # fetch params to pass to the page_unpublished_signal, before the
-            # deletion happens
-            specific_class = page.specific_class
-            specific_page = page.specific
+            # Unpublish the page
+            page.unpublish()
 
         parent_id = page.get_parent().id
         page.delete()
 
-        # If the page is live, send the unpublished signal
-        if page.live:
-            page_unpublished.send(sender=specific_class, instance=specific_page)
-
         messages.success(request, _("Page '{0}' deleted.").format(page.title))
 
         for fn in hooks.get_hooks('after_delete_page'):
@@ -533,18 +526,11 @@ def unpublish(request, page_id):
         raise PermissionDenied
 
     if request.POST:
-        parent_id = page.get_parent().id
-        page.live = False
-        page.save()
-
-        # Since page is unpublished clear the approved_go_live_at of all revisions
-        page.revisions.update(approved_go_live_at=None)
-
-        page_unpublished.send(sender=page.specific_class, instance=page.specific)
+        page.unpublish()
 
         messages.success(request, _("Page '{0}' unpublished.").format(page.title))
 
-        return redirect('wagtailadmin_explore', parent_id)
+        return redirect('wagtailadmin_explore', page.get_parent().id)
 
     return render(request, 'wagtailadmin/pages/confirm_unpublish.html', {
         'page': page,
diff --git a/wagtail/wagtailcore/management/commands/publish_scheduled_pages.py b/wagtail/wagtailcore/management/commands/publish_scheduled_pages.py
index 51f95fff2..4d47d14e0 100644
--- a/wagtail/wagtailcore/management/commands/publish_scheduled_pages.py
+++ b/wagtail/wagtailcore/management/commands/publish_scheduled_pages.py
@@ -7,7 +7,6 @@ from django.core.management.base import BaseCommand
 from django.utils import dateparse, timezone
 
 from wagtail.wagtailcore.models import Page, PageRevision
-from wagtail.wagtailcore.signals import page_published, page_unpublished
 
 
 def revision_date_expired(r):
@@ -56,15 +55,11 @@ class Command(BaseCommand):
             else:
                 print("No expired pages to be deactivated found.")
         else:
-            # need to get the list of expired pages before the update,
-            # so that we can fire the page_unpublished signal on them afterwards
-            expired_pages_list = list(expired_pages)
-
-            expired_pages.update(expired=True, live=False)
-
-            # Fire page_unpublished signal for all expired pages
-            for page in expired_pages_list:
-                page_unpublished.send(sender=page.specific_class, instance=page.specific)
+            # Unpublish the expired pages
+            # Cast to list to make sure the query is fully evaluated
+            # before unpublishing anything
+            for page in list(expired_pages):
+                page.unpublish(set_expired=True)
 
         # 2. get all page revisions for moderation that have been expired
         expired_revs = [
diff --git a/wagtail/wagtailcore/models.py b/wagtail/wagtailcore/models.py
index baa13d75e..6c15259f9 100644
--- a/wagtail/wagtailcore/models.py
+++ b/wagtail/wagtailcore/models.py
@@ -31,7 +31,7 @@ from wagtail.utils.deprecation import RemovedInWagtail06Warning
 from wagtail.wagtailcore.utils import camelcase_to_underscore
 from wagtail.wagtailcore.query import PageQuerySet
 from wagtail.wagtailcore.url_routing import RouteResult
-from wagtail.wagtailcore.signals import page_published
+from wagtail.wagtailcore.signals import page_published, page_unpublished
 
 from wagtail.wagtailsearch import indexed
 from wagtail.wagtailsearch.backends import get_search_backend
@@ -450,6 +450,19 @@ class Page(six.with_metaclass(PageBase, MP_Node, ClusterableModel, indexed.Index
         else:
             return self.specific
 
+    def unpublish(self, set_expired=False):
+        if self.live:
+            self.live = False
+
+            if set_expired:
+                self.expired = True
+
+            self.save()
+
+            page_unpublished.send(sender=self.specific_class, instance=self.specific)
+
+            self.revisions.update(approved_go_live_at=None)
+
     def get_context(self, request, *args, **kwargs):
         return {
             'self': self,