I used to ride up in the mountains solo at night, but eventually reached a point where I stopped as the wisdom of age made me realize how easy it would be to get really hurt in areas with no cell phone service for miles. Mrs busydog, of course, considered it sheer lunacy.
Regularly saw lots of wildlife—deer, coyotes, raccoons, foxes, skunks, badgers, etc–and a couple of times a bear and the occasional bobcat—-but in my mind’s eye, I was sure they were all just off the trail, waiting for dinner.
It definitely can get spooky and your imagination tends to work overtime.