I can tell you sth unbelievable last night:
when it was 3:30 am, my dog(sleeps in my room on her own bed) started to bark continuously towards the window of my room, in a fighting position, seriously. She barked and she went to every room to wake up the whole family. Even after we checked out the window and get the lights on, she did not lay lown her fighting position. She kept being alarmed for around half an hour(she's usually amazingly smart).
We believed that she's trying to scare away the thief, as a thief broke into my home and left a cleaver in my home many years ago!
Little animals sometimes have a better sense and understanding than human!