At the risk of sounding totally insane we have spirits in our house.
Dd (21) has always heard people talking at night, going up and down stairs, walking the landing etc
After my divorce it got worse and lights were going on and off, doors closing etc.
I had a priest round who blessed the house, then a clairvoyant 'cleaner' which made things much better.
Now things are starting again, dd hearing things and now ds1 has told dd he often feels like there's someone in his room.
Last night I woke to him screaming from his bedroom that there were people whispering outside his room and walking along the carpet! He was too afraid to even come out. Now ds1 is a no nonsense rugby playing teen who is certainly not hysterical at any time. He ended up sleeping with his sister (he'd generally rather die than this!)
There was also a cross knocked off a shelf and down the back of cupboards in ds2 room when I was here alone.
Don't know what to do? Do I get cleaning lady back?
Are we all going crazy? 
(Sorry didn't know where else to post this)