We manage. It's what we're used to. Don't forget those long summer months (well just imagine them for a moment) when you can run out on the hills til late.
6 months of the year it's light enough to run out in the countryside in the evenings, at the weekends or whatever day you get off. I work a haphazard shift pattern so I sometimes run to and from work, that can be a 25 mile round trip. Luckily I work 12 or 18 hr shifts.
So - running with a head torch is sensible, also hiviz clothing with reflective strips. There are other lights that help you see and be seen, you can always carry a small torch as well.
Of course you have to run slower and take more precautions when running at night but nothing should get in your way of doing so. Find routes that are safer - tracks and trails and green lanes or similar. There must be something around.
Buy a map or use google maps, have a look at BikeHike for the potential of safer local routes or get on your bike and go somewhere else to run. I cycle out to my runs all the time.
Have a look at the stupid o'clock thread.