Why does the grimreaper try to take me in my nightmare?

I was standing in this dark place and as i look ahead i see a figure, get closer and than it appears to me holding his sickle,the grim-reaper putting his arm out to reach for my arm. telling me come on. Why did i have this dream /nightmare. I start to scream no, no, not ready to go. My scream woke my husband, who than woke me -up. What does this mean, good - or bad for me what?