Dream of screaming, chased

I keep having this dream about a green big evil eyed alien. Over the past few weeks. Its just stood there at first looking at me it couldn't touch me then it seemed to get stronger and closer and able to touch me and make me feel scared and then it started talking. Then finally last night after like three weeks of dreaming it it chased me through my house I was screaming my dad was trying to get it and I chopped its head off in my kitchen. It just grew back. I don't know what this means