My new night terrors

I've always been a very weird sleeper. As a child, I would walk and talk in my sleep. After college, I'd wake up in the middle of the night doing some very bizarre things. Once, I was on my hands and knees in my closet, I'd taken out all of my shoes and piled them in the middle of the floor, and I was searching for the hole that the gnomes came through. Another time, I had removed all of the framed pictures from the wall and leaned them against my bed. Since I've been married, my "night terrors" have been more along the lines of thinking I see giant spiders on the ceiling, or that there are things hanging from the shelves or lamps.

The last week or so, I haven't slept well at all. Each night, I've woken up with the frantic realization that I've lost the Bug somewhere in my room. Like I was supposed to be watching her but then she disappeared. I look in the covers, under the bed, under the desk, in the bathroom. Mind you, she's still sleeping soundly in her crib in her room. I read in the Times that this is fairly common for new mothers to experience. But the Bug's a year old... so why now?