Most of the time ghosts like to move the little things because it makes it less noticeable. In general, if things are moving around on you, you better call the Ghostbusters. Your lamps and your tv's are turning themselves on and off. Be sure to check you're not sitting on the remote. Make sure the lightbulb is screwed in tightly.
Ghosts like to mess with anything electrical.
Your dog is barking at something that isn't there. Your cat is acting weird. Pets are able to see the dead. Just like that kid in the Sixth Sense. You're asleep and you hear a woman crying, a child laughing, or a man whispering.