I think you probably have got spirits in the house.
My daughter and her husband (who is a bit psychic) lived in a house which was haunted by 2 spirits - one did them no harm, but the other was really malevolent. They heard footsteps in the hall upstairs, the children used to be woken up etc. When they went out, everything downstairs would be tidied up and the place would be absolutely spotless! They eventually got a psychic person in and she said that the house the spirits of a married couple. The old man was upstairs and it was him that evil and the woman was downstairs and she was the one tidying up. One night my daughter went upstairs to check on the children and actually saw her eldest son (about 5 at the time) being lifted up from the pillow. She said it was as tho someone had him by the scruff of the neck and was shaking him.
They stayed in the house for 6 months and things got so bad with the evil spirit, who was apparently trying to intimidate my son-in-law, they had to leave the house in the end.