terrain_type = self.thing.game.terrains[terrain]
             if 'sittable' in terrain_type.tags:
                 self.thing.standing = False
-                self.thing.send_msg('CHAT "You sink into the %s.'
+                self.thing.send_msg('CHAT "You sink into the %s. '
                                     'Staying here will reduce your weariness."'
                                     % terrain_type.description)
         self.thing.invalidate('fov')
 
         if random.random() > 0.9999:
             if self.standing:
                 self.weariness += 1
+                if self.weariness % 5 == 0:
+                    self.send_msg('CHAT "All that walking or standing makes '
+                                  'you weary, and thereby slower. Find a place '
+                                  'to sit or lie down to regain energy."')
             elif self.weariness > 0:
                 self.weariness -= 1
             self.game.changed = True