Haunted House Update...

So I was upstairs in my room yesterday afternoon when I heard something odd.  It was a cross between a moan and a sob.  You know what it's like when you hear a sound you've never heard before and although you can't place it, you're certain it was made by a person and not anything mechanical.  I went downstairs, asked my partner, "What was that noise?"  He looked at me strangely, said, "What noise?"  Now, when upstairs, the sound seemed distant yet quite near.  And it was so mournful, so full of pain.  I have no idea where it came from.  A little creepy.