I've done plenty of solo night rides. I know that nervous feeling that creeps in at times - keeps things interesting. Also the occasional close by leaf or branch that creates the "running" shadow in your peripheral vision.
I've never had any paranormal experiences (or even seen people on the trails other than riders), maybe the only weird thing that happened to me was during the 24 Hours of Great Glen last year - I was riding a night lap and a bat flew into my face - or maybe I rode into the bat. In either case It did give me the willies for a few moments.