Recurring Nightmare

JJ woke up last night, very upset. And I do mean VERY upset. Crying, clearly frightened. I brought him to bed with us, and it got *worse* - the minute he realized I was trying to put him down on the bed, he started throwing himself around, pitching a fit. We finally got him calmed down enough to talk to us (well, communicate as well as an 18 month old can), and he told us that there was a man in the backyard looking in the bathroom window. This is the second time he's woken up with this dream (and it clearly is a dream - he hadn't even been in the bathroom to be able to see if anyone was looking in the window). He wouldn't go back to sleep until John took him outside and showed him the backyard and all the corners to prove there was no one back there! Even after that he slept very restlessly, waking up a lot. Poor little guy.

I feel so bad for him having these nightmares, and at the same time it gives me the shivers. I mean, where would he have gotten the image of a man in the back yard looking in the bathroom window and associated it with being a scary thing? Creepy.