You don't sound silly at all. Both my DD's went through periods at that age and younger where they would cry out in their sleep. Most of the time they would go back to sleep. I just put it down to dreaming. Is your DD doing it every sleep and multiple times? If she is, maybe she is in pain and it might be worth getting a general check up at the GP. But if it's only occasionally it sounds pretty normal to me from my experience. HTH!