I love solo night riding. Such comfort in the isolation.
Is addition to the warning by @haggis1978, I’d urge some caution however. A number of years ago on a solo night ride, I managed to hit a gate which had been closed since I passed it on the outward loop of the ride. Travelling at about 20 on a nice fast downhill, I just glimpsed it in the front light with enough time to look over the top when I hit it.
I snapped the head tube of my bike and hit my chest and forearms on the gate as I flipped over the top. I came round about 20 later and was alone in the pitch black, with no lights and no prospect of help/rescue. 1hr later of dragging the remains of my bike towards civilisation with a broken arm, ribs and skull fracture I was lucky enough to meet another cyclist.
I now ride with a tracker and one of those specialized helmets which senses a crash and informs an emergency contact.
Be prepared, even if you’re only a few miles from home.