Not under my pillow, but it's within arm's reach. Has nothing to do with the PTSD, though; just something I've done for years. I'm married to a cop...guns are just normal in our house, as well as on our person (he's almost always carrying, even off-duty).
I do carry a knife almost all the time, though. That's something I started doing shortly before the dog bit me, when I considered the fact that it might happen. DH was furious when he found out why, but turns out I was right.