Not to scare you or anything, but the worst thing I could imagine is having this thing watching you sleep..wow..i would pull out my sawed-off after
that.. : - /.
Seriously, you might be hallucinating, I can't explain the sighting on the street other than light, reflections, i dunno, but, since you were at the
computer, your eyes may have been tired..I dunno. I know your gonna read this and think I am juss ignorant and trying to blow it off, but I would look
at this rationally before claiming it as a 'ghost'. A poltergeist perhaps, but not ghost
Try communicating - I know it didn't respond before, but try again, and again if you have to. It might answer eventually. Who knows?
Good luck.
-wD