Realdeal, that was my experience, too... I always hear about it at night, especially with kids, but when I had it, I started feeling icky at about 6, d* at 7ish, then v* within the hour. My mom's last sv* hit her in the middle of the afternoon, too, which blew my "theory" out of the water. I think, though, a majority hits at night like everyone has said-- because of the incubation period / time frame.