I woke up at 4:40 this morning, I had to get up at 5 so I didn't think too much of it.
Then I heard a soft 'sigh' come from the middle of my room. I thought it was my dog, he's been known to make creepy human-like sounds, or sleep paralysis.
But my dog was on the other side of me, wide awake.
He started growling, then barking his deep-pitched bark.
He jumped off the bed and started running around the house barking.
I got up and turned on the light closest to the bed to see if there was a burglar or something. But there wasn't anything wrong.