Laying down, rythmically grunting - mmmmm maybe she won't wait til the morning
Is her breathing normal or starting to get a bit rapid (contractions) ?
Any tail swishing ?
Is it her first farrowing ?
I always think they go into an almost trance like state - just think of a woman giving birth, all hell could be breaking out around them and they wouldn't care.
Oh, I'm almost as excited as you
Glad you've got a heater