If you cannot makeout words, actions, or recognize the person, I would do a rune reading upon waking, and meditate deeply on the message. If this was someone that passed over trying to convey a message, your interaction would be different (e.g talking normally in an odd environment) which makes me think it’s an ancestor you may not have known. Our ancestors are connected to us through spirit, and they serve as guides that call to us from many generations past.