Sounds like the spirit is probably somebody attached to you or your family. Could be an old friend or family member. It could also be a guardian angel. Either way, it's somebody who cares for you and is there to make sure you're safe. If possible, see if you can figure out more about the spirit. Is it male or female? Young or old? A psychic friend might even be able to pick up a name. Welcome them, talk to them and consider them part of the family - because they probably are. In some cases, they might be staying only because they care for you too much and are afraid if they move on something bad might happen in their absence. Let them know you'll be ok and that they can move on if they'd like. It feels funny talking to thin air and not knowing if you're being heard or not, but you are and in time it's almost comforting knowing their's someone watching over you.
Hope this helps,
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