a ghost shared my bed

I am 76 years old and not subject to fantasy but one night when I was staying at a friends house a strange thing happened. As I lay in bed the figure of a woman, dressed in long mustard coloured robes, floated into my room. She floated by the side of the bed and then lay down beside me! She spoke to me but her words were indistinct I asked her to repeat the words but still couldn't make them out. Then she just faded away. In the morning I asked my friends if anyone had entered my room that night and of course they hadn't. Sometimes I do have very vivid dreams but throughout this experience I was fully awake.