I have had similar things happening to me lately. I thought I heard my stepdaughter calling me one time and I heard my husband say my name but he wasn't around. There are other instances like I would hear a loud "thud" upon trying to fall back asleep. I'm not sure if it's another spirit but if it is, I don't feel it's negative. Perhaps, it's trying to communicate something and I'm just too dense to understand right now. But I'm not worried about it all. i used to have these experiences as a child and was never harmed or frightened. Imagination? It's a possibility but I'm pretty sure these instances are real for me.