I've had that happen to me when I was baby sitting my nephew at my sisters house.
He was cranky and was crying non stop for most of the night when he suddenly stopped and stared at the corner of the room and so did my sisters dog...
My sister told me earlier that week about some strange stuff in that house eg
My sister was watching her son in his cot and she fell asleep, she was woken up by what felt like someone tapping her on the head. When she woke up
her son was half out of his cot and about to fall... kind of lucky huh?