I had over 40 dreams about my sister dying in a 10 day period.

For some reason over a 10 day period I had over 40 dreams about my sister dying. There was never a cause of death revealed in any of the dreams, she was just dead. I was having several per night and they were so intense that they were the first thing I thought about as soon as I woke up. They were all different dreams but in each one of them my sisters' death was central to the dream itself. Well, after about 10 days they just suddenly stopped. I haven't had one in nearly 2 weeks now.

I hadn't told anyone about them but my wife so she is the only one that knows. Does anyone know what this could mean? I assume it's not a straightforward answer and it probably means something entirely different than death itself.