Personally I would be fine with the long nights in itself. Just bring something to read.
However, the thing that really deters me is the combination of limited amount of available hiking hours during daylight and the prospect of having to stay in my tent because of bad weather. So you could be holed up in a dark tent for a long time.
For me a multi-day camping trip would mean going to Scotland, because that is the only place where I can wild camp. But living on the south coast, that is quite a commitment. I cannot easily go back home if things get very miserable. There isn't much point in hillwalking if you can hardly see your own feet, and that is a common condition in the hills. In the summer I just put up with it and sit it out if necessary, but with short daylight that can get quite depressing.